No log book or similar to show how the numbers were calculated so that the attempt was for the number of people actually dancing rather than just attending the event.
'Moved the goalposts'
John Trickey, chairman of the Regatta Committee, said: "We were in contact with Guinness for a period of nearly nine months prior to the event and we wanted it very clear what we had to do to get the recognition for it.
"We had a set of rules and we genuinely believe we abided by those rules.
"This event was spread over a mile-and-a-quarter - how could we have a video camera showing a guy at one end was in step with a young lady at the other end?
"We genuinely feel that they moved the goalposts, 23,805 people were there and did it.
"We are going to put out a petition and we want people who were there to sign it.
"We have a world record for the largest YMCA dance - we smashed the existing record and if Guinness choose not to recognise it, they have the problem not us."
Guinness said nobody was available for comment, but it did confirm the reasons the record attempt was rejected.