Right, that is your lot from me here - but the afternoon is just getting started...
Head over here to join our coverage of all the 15:00 GMT FA Cup kick-offs.
Until the next time!
'Intensity and quality'
FT: Peterborough 1-5 Leicester
Leicester City
Leicester manager Claude Puel, on BT Sport:
"It was Important to start well, with intensity and quality. We did that and went on to score some very good goals. It was important for the squad that we could perform well today.
"Today we had good focus to recover the ball together and to play good football.
"Fousseni Diabate played in the second division in France but he had some quality to play in Premier League. It was a perfect first game. Now it's important he continues to work hard."
WATCH: Double for impressive Diabate
Peterborough 1-4 Leicester
A second for Fousseni Diabete crowns off an impressive debut.
'I waited for my opportunity'
FT: Peterborough 1-5 Leicester
Leicester City
Leicester Kelechi Iheanacho, on BT Sport: "I think I am waiting for my opportunity, it has been a good season so far. I waited for my opportunity and took my chance, that is what we needed."
Leicester defender Christian Fuchs on BT Sport: "To be honest we are looking forward now to the next league game against Everton, but in the next round whoever comes will come, we are happy with the result today."
Get Involved
#bbcfacup or 81111 on text
Steve Fisher: I know it was Peterborough and we should win but we never batter anyone... so this was nice.
'All about attitude'
Peterborough 1-5 Leicester
Danny Mills
Former England defender on BBC Radio 5 Live
That's a little bit harsh on Peterborough.
It was all about attitude for Leicester, players at a higher level can think 'we are better than them' but Leicester were having none of that and they matched Peterborough tackle for tackle. You could see they wanted to put the game to bed in that first half - they were absolutely first-class today.
Diabate has to get man of the match, he was absolutely superb and set the tone for Leicester.
ReutersCopyright: Reuters
Post update
FT: Peterborough 1-5 Leicester
Fousseni Diabate is all smiles. The 22-year-old Mali youth international applauds Leicester's 4,000 travelling fans.
A first-class performance from the Foxes' second string.
Into the FA Cup fifth round they go. League One Peterborough know they have been outclassed.
PACopyright: PA
FULL-TIME
Peterborough 1-5 Leicester
That's the last kick!
GOAL - Peterborough 1-5 Leicester
Wilfred Ndidi
This is all about Fousseni Diabate again. He beats his man in the box with ease, cuts back across goal, and Wilfred Ndidi fires in. Easy.
Quite the debut from the lad.
'Diabate like Rashford'
Peterborough 1-4 Leicester
Danny Mills
Former England defender on BBC Radio 5 Live
Top corner, the goalkeeper had no chance - Diabate looks like a really promising player. He's a lot like Marcus Rashford, picking the ball up and taking players on.
"It'll be interesting to see how he fairs in the Premier League," adds Conor McNamara...
Rex FeaturesCopyright: Rex Features
Post update
Peterborough 1-4 Leicester
TWO minutes added on. Ryan Tafazolli tamely nods a deep free-kick into Ben Hamer's grasp.
DISALLOWED GOAL
Peterborough 1-4 Leicester
Junior Morias smashes the ball home - a fine finish! But the flag is up for offside. It won't count.
Just stoppage time left...
SUBSTITUTION
Peterborough 1-4 Leicester
A last change from Peterborough, who have been well beaten today.
Andrea Borg on for Marcus Maddison.
GOAL - Peterborough 1-4 Leicester
Fousseni Diabate
Well, he's actually offside for me, but Fousseni Diabate has his second - and on his debut too.
There's one big launch forward from Jonathan Bond. More in hope than anything. Leicester pick it off. Demarai Gray zooms into space - so easy - and shoots on goal. It's saved well by Bond, but Diabate is there to fire in the rebound.
Replays show that as Gray shot, Diabate was beyond the last man.
Post update
Peterborough 1-3 Leicester
All Leicester here really.
Marc Albrighton zips a cross in, Steven Taylor adjusts well to turn behind for a corner.
CHANCE!
Peterborough 1-3 Leicester
The sub Ben Chilwell with a chance to shoot first-time from a cut-back on the break...
Poor. Straight at the keeper.
FIVE to go...
Post update
Peterborough 1-3 Leicester
It's all gone a bit... flat.
Marcus Maddison has no joy down the right wing - he thinks he was pulled back but the ref says now and Leicester are back with it...
WATCH: Hughes gives Peterborough a chance...
Peterborough 1-3 Leicester
Is there time for more?
Post update
Peterborough 1-3 Leicester
Jack Marriott turns to face goal, darts into a channel in the box but the cross is poor - straight at Ben Hamer.
EIGHT minutes to go.
SUBSTITUTION
Peterborough 1-3 Leicester
A change for Peterborough too - Idris Kanu has replaced Danny Lloyd in attack for this final push.
Live Reporting
Patrick Jennings
All times stated are UK
Get involved
ReutersCopyright: Reuters 
PACopyright: PA 
Rex FeaturesCopyright: Rex Features
Latest PostPost update
Right, that is your lot from me here - but the afternoon is just getting started...
Head over here to join our coverage of all the 15:00 GMT FA Cup kick-offs.
Until the next time!
'Intensity and quality'
FT: Peterborough 1-5 Leicester
Leicester City
Leicester manager Claude Puel, on BT Sport:
"It was Important to start well, with intensity and quality. We did that and went on to score some very good goals. It was important for the squad that we could perform well today.
"Today we had good focus to recover the ball together and to play good football.
"Fousseni Diabate played in the second division in France but he had some quality to play in Premier League. It was a perfect first game. Now it's important he continues to work hard."
WATCH: Double for impressive Diabate
Peterborough 1-4 Leicester
A second for Fousseni Diabete crowns off an impressive debut.
'I waited for my opportunity'
FT: Peterborough 1-5 Leicester
Leicester City
Leicester Kelechi Iheanacho, on BT Sport: "I think I am waiting for my opportunity, it has been a good season so far. I waited for my opportunity and took my chance, that is what we needed."
Leicester defender Christian Fuchs on BT Sport: "To be honest we are looking forward now to the next league game against Everton, but in the next round whoever comes will come, we are happy with the result today."
Get Involved
#bbcfacup or 81111 on text
Steve Fisher: I know it was Peterborough and we should win but we never batter anyone... so this was nice.
'All about attitude'
Peterborough 1-5 Leicester
Danny Mills
Former England defender on BBC Radio 5 Live
That's a little bit harsh on Peterborough.
It was all about attitude for Leicester, players at a higher level can think 'we are better than them' but Leicester were having none of that and they matched Peterborough tackle for tackle. You could see they wanted to put the game to bed in that first half - they were absolutely first-class today.
Diabate has to get man of the match, he was absolutely superb and set the tone for Leicester.
Post update
FT: Peterborough 1-5 Leicester
Fousseni Diabate is all smiles. The 22-year-old Mali youth international applauds Leicester's 4,000 travelling fans.
A first-class performance from the Foxes' second string.
Into the FA Cup fifth round they go. League One Peterborough know they have been outclassed.
FULL-TIME
Peterborough 1-5 Leicester
That's the last kick!
GOAL - Peterborough 1-5 Leicester
Wilfred Ndidi
This is all about Fousseni Diabate again. He beats his man in the box with ease, cuts back across goal, and Wilfred Ndidi fires in. Easy.
Quite the debut from the lad.
'Diabate like Rashford'
Peterborough 1-4 Leicester
Danny Mills
Former England defender on BBC Radio 5 Live
Top corner, the goalkeeper had no chance - Diabate looks like a really promising player. He's a lot like Marcus Rashford, picking the ball up and taking players on.
"It'll be interesting to see how he fairs in the Premier League," adds Conor McNamara...
Post update
Peterborough 1-4 Leicester
TWO minutes added on. Ryan Tafazolli tamely nods a deep free-kick into Ben Hamer's grasp.
DISALLOWED GOAL
Peterborough 1-4 Leicester
Junior Morias smashes the ball home - a fine finish! But the flag is up for offside. It won't count.
Just stoppage time left...
SUBSTITUTION
Peterborough 1-4 Leicester
A last change from Peterborough, who have been well beaten today.
Andrea Borg on for Marcus Maddison.
GOAL - Peterborough 1-4 Leicester
Fousseni Diabate
Well, he's actually offside for me, but Fousseni Diabate has his second - and on his debut too.
There's one big launch forward from Jonathan Bond. More in hope than anything. Leicester pick it off. Demarai Gray zooms into space - so easy - and shoots on goal. It's saved well by Bond, but Diabate is there to fire in the rebound.
Replays show that as Gray shot, Diabate was beyond the last man.
Post update
Peterborough 1-3 Leicester
All Leicester here really.
Marc Albrighton zips a cross in, Steven Taylor adjusts well to turn behind for a corner.
CHANCE!
Peterborough 1-3 Leicester
The sub Ben Chilwell with a chance to shoot first-time from a cut-back on the break...
Poor. Straight at the keeper.
FIVE to go...
Post update
Peterborough 1-3 Leicester
It's all gone a bit... flat.
Marcus Maddison has no joy down the right wing - he thinks he was pulled back but the ref says now and Leicester are back with it...
WATCH: Hughes gives Peterborough a chance...
Peterborough 1-3 Leicester
Is there time for more?
Post update
Peterborough 1-3 Leicester
Jack Marriott turns to face goal, darts into a channel in the box but the cross is poor - straight at Ben Hamer.
EIGHT minutes to go.
SUBSTITUTION
Peterborough 1-3 Leicester
A change for Peterborough too - Idris Kanu has replaced Danny Lloyd in attack for this final push.