BBC Sport outlines the promotion and relegation issues - and the race for European qualification - in England and Scotland for 2020-21.
The coronavirus pandemic forced some leagues to be suspended for a spell, and others to be shortened or curtailed prematurely.
Recent confirmed promotions, relegations, titles & qualifications
Manchester City clinched the title on 11 May after nearest rivals Manchester United lost 2-1 to Leicester.
City will be joined in the Champions League group stage by Manchester United and the other two teams in the top four. If City win this season's Champions League, or United win the Europa League, there is no extra European place for English clubs.
If Chelsea win the Champions League but finish outside the top four, they will also qualify for the Champions League group stage.
FA Cup winners Leicester City have qualified for the Europa League group stage. They can still make the Champions League instead if they finish in the top four.
The fifth-placed Premier League team will also qualify for the Europa League group stage - as will the sixth-placed team as Leicester can finish no lower than fifth.
Manchester City's Carabao Cup final victory means that that competition's Europa Conference League place (Uefa's new tournament) will revert to the league - going to the highest-placed team not yet qualified for Europe.
Chelsea and Liverpool cannot finish lower than seventh, so are guaranteed a Europa Conference League place at worst.
Sheffield United were relegated to the Championship when they lost 1-0 at Wolves on 17 April, going down with six games still to play. West Bromwich Albion joined them after losing 3-1 at Arsenal on 9 May, as did Fulham after losing 2-0 to Burnley on 10 May.
Norwich City were promoted before kicking a ball on 17 April after rivals Swansea and Brentford both failed to win, and clinched the title with a game to spare by beating Reading 4-1 on 1 May. Watford secured the second automatic promotion slot with a 1-0 win over Millwall on 24 April.
In the play-offs for the third promotion place, Brentford face Bournemouth, while Swansea City meet Barnsley in the semi-finals on 17 and 22 May.
Three teams were relegated to League One, all on the final day of the season - Sheffield Wednesday went down after drawing 3-3 with Derby (who stayed up), while Rotherham United suffered the drop after a 1-1 draw at Cardiff and Wycombe Wanderers were relegated despite beating Middlesbrough 3-0.
Hull City confirmed their promotion to the Championship with a 2-1 win at Lincoln on 24 April, and clinched the title on 1 May by beating Wigan 3-1. Peterborough United clinched the second automatic promotion place on 1 May after a 3-3 draw with Lincoln.
In the play-offs for the third promotion place, Blackpool face Oxford United, while Sunderland meet Lincoln City in the semi-finals from 18-22 May.
Bristol Rovers were relegated to League Two on 24 April after losing 1-0 at Portsmouth and Swindon Town joined them later that day after a 5-0 loss at Milton Keynes. Rochdale and Northampton Town went down on 1 May after losing to Doncaster and Blackpool respectively.
Cheltenham Town secured promotion to League One with a 1-1 draw against Carlisle on 27 April, and clinched the title on the final day of the season by beating Harrogate 4-1. Earning the other automatic promotion places on the final day were Cambridge United, who beat Grimsby 3-0, and Bolton Wanderers, who hammered Crawley 4-1.
In the play-offs for the fourth promotion place, Morecambe face Tranmere Rovers while Newport County take on Forest Green Rovers in the semi-finals from 18-23 May.
The champions will be automatically promoted to League Two, with the next six teams entering a play-off.
The title is between Sutton and Torquay. Sutton need a maximum of four points from their last two games to clinch it.
Whoever does not finish top will contest the play-offs with Stockport, Hartlepool and three other teams.
With Macclesfield Town expelled, Dover Athletic's results expunged, and the National League North and South divisions declared null and void for 2020-21, there will be no relegation from the National League this season.
The Premiership split in half after 33 games, with each club playing the others in its "half" for a fourth and final time.
Rangers were confirmed as champions on 7 March after nearest rivals Celtic drew 0-0 with Dundee United, and will enter the Champions League at the third qualifying round.
Celtic finish as runners-up and will enter the Champions League at the second qualifying round.
Third-placed Hibernian, fourth-placed Aberdeen and fifth-placed St Johnstone have all qualified for European competitions.
If Hibs win the Scottish Cup, they will enter the Europa League play-off round, with Aberdeen and St Johnstone in the new Europa Conference League's second qualifying round.
Alternatively, if St Johnstone win the Cup, they will enter the Europa League play-off round, with Hibs and Aberdeen in the Europa Conference League's second qualifying round.
Bottom club Hamilton Academical were relegated to the Championhip on the final day of the season after losing 2-0 to 11th-placed Kilmarnock, who will face Championship side Dundee in a two-legged play-off on 20 and 24 May.
Hearts clinched the title and promotion to the Scottish Premiership on 10 April after two of their rivals could only draw.
In the play-off final, Dundee face Premiership side Hamilton over two legs on 20 and 24 May for the final place in next season's top flight.
Bottom club Alloa Athletic were relegated to Scottish League One after losing 2-1 to Raith on 17 April. Ninth-placed Greenock Morton will face League One side Airdrieonians in the two-legged play-off final on 18 and 21 May.
Scottish League One
Champions Patrick Thistle secured automatic promotion to the Scottish Championship with a 5-0 win over Falkirk on 29 April.
In the two-legged play-off final on 18 and 21 May, Airdrieonians take on the ninth-placed Championship side, Greenock Morton.
Bottom club Forfar Athletic were relegated to Scottish League Two on 1 May despite a 2-1 win at Peterhead. Ninth-placed Dumbarton will face League Two side Edinburgh City in the two-legged play-off final on 17 and 20 May.
Scottish League Two
Queen's Park were promoted to Scottish League One as champions after a goalless draw with Elgin on 20 April.
In the two-legged play-off final on 17 and 20 May, Edinburgh City take on the ninth-placed League One side, Dumbarton.
Bottom side Brechin City must enter a two-legged play-off against Lowland League winners Kelty Hearts (who beat Brora Rangers 6-1 over two legs) on 18 and 23 May - with the overall winners taking the final place in League Two for 2021-22.