MOVE over Linda Barker and Laurence Llewellyn-Bowen ... two local designers performed a "Changing Rooms" - style make-over - despite a flood.   Not even torrential rain could mar the prize-winning transformation by Failsworth designers Matthew McCartan and Simon Ashley. They scooped the public award, voted for by visitors, and £500 to give to charity at the Homes Exhibition at Tatton Park, Cheshire - despite the small matter of a stream running through their room. The pair, who run Ashley Interiors, were given only two days to create a three-metre-square room in a marquee, but from the start they hit problems. "Our walls did not get there until 4 pm on the Wednesday, so we just had until 5.30 pm the following day to finish," said Matthew. "It was also a disaster on the Friday as there was torrential rain and we got flooded. There was a stream running through our room and everything was just a muddy mess." An industrial carpet-cleaner was a must for the duo's cream carpet, as was the unusual addition of plastic tumblers, put on the legs of furniture which had been borrowed for the occasion. Despite the mishaps, they managed to impress the public with their design - a cream and gold dining room complete with a Regency table, French chairs, tented ceiling and chandelier. It was all the more impressive because they only established their business run from home, two years ago.   Donated They will now feature in Concept for Living magazine and have donated their prize-money to the Rainbow Family Trust. Matthew said: "The rain brought all the designers together and we were rushing from room to room to help each other. "We did not really expect to win, but we thought we had nothing to lose and we just wanted to receive some recognition. "It was the award chosen by the public which we really wanted to win, because you can't pull the wool over the public's eyes."