i would totally disagree with minion...dont go and get ten quotes,dont waste your time..there are a million guys out there now doing every job you can think of,and havent a clue what there doing.in an economy like this people will try anything when they dont know what there doing and bluff it...,ask your friends or neighbours or anyone you trust who works in the construction trade for recomendations,and only get these or a repuatable firm to do your job ,its going to be an expensive job anyway and for the sake of a few hundred quid get it done properly,cause it will save you money in the long run..