Runners who completed this year's race in seven hours have been offered a place at next year's.Read more
Kerrie Aldridge says she was sniggered at as she took nine hours and 11 minutes to finish the race.
A pacesetter for the London Marathon who was supporting the slower runners says contractors started the clean-up after they were just a few miles into the race and shouted abuse.
One of the official pacers at the London Marathon has said she and fellow runners were treated "horrifically" during the race.
Liz Ayres was asked to run the course in 7.5 hours to aid participants.
She said runners were called "fat" and "slow" by contractors and volunteer marshals - and one woman received chemical burns from the clean-up operation that began around them.
Marathon organisers said they were "very sorry to hear" of her experience.