cheers for all the replies folks
not sure what started the fire and never will unfortunately.car was running fine,overboosting to 1.95bar
but thats nothing excessive.felt like it had fuel cut or similar and then an almighty bang,no power and a big puff of white smoke
stopped the car,first thought was oh well there goes the block,i'll get it towed home and plan the next stage.
saw the amount of smoke still coming out the engine bay,jumped out the car and went to open the bonnet but
the fire was well under way.too late,greig phoned the fire dudes and ahem 30mins later they turned to put out the fire by which time as you can imagine it was totally fecked.
not sure what i'll do next,the spec c is a hard act to follow