Thanks for the replies guys,much appreciated.
Noel,there is a story behind the bus depot! It is from the Metcalfe range and I saw the kit on ebay on a buy-it-now or make an offer,so I put in a cheeky low offer and was surprised to have it accepted,us modellers are always looking for a bargain! The kit arrived and the seller kindly put in an extra kit FOC,an O gauge building! I thought,what do I want with an O gauge building,before it dawned on me I had bought an O gauge bus depot! In my quest for a bargain,I had omitted my own rule of research what you are buying! Anyway,undeterred,I omitted the 2 side buildings,cut down the main building to the right height and then covered it with brick paper.The roof is the original O gauge roof as supplied in the kit,but I feel it does not look out of place as the roofs on these depots tended to be quite high.So,if I sell my freebie building for a couple of quid,the bus depot will have cost me less than a tenner including postage,so I am quite pleased with the outcome!