The Moon Under Water is a pub in Manchester city centre, in the building of the former Deansgate Picture House cinema on Deansgate. The pub, which is 8800 sqft and can hold 1,700 customers has been noted by the "Guinness Book of Records" as being the largest in Britain. Other sources claim it is the largest in Europe.
Looking at a list of the largest pubs in England, the Moon under the water in Manchester has the largest floor area with 8800 sqft on each of it's 3 floors
There can not be 8800 sqft on each of 3 floors as the floor area total is 8800 across all floors.