My T250 was Cat B but reshelled had no problems at all Just speak to DVLA before you buy it . Ask them if there are any discrepancies that will stop you changing log book over OR getting an MOT. Then the usual checks ie are the Police interested in it ? if not then away you go! That T250 WAS the mintest straightest Focus chassis i have come across!

My current Focus Rs mk1 was also reshelled but wasnt cat b - however it does have a different chassis number ie starts with SABT not the usual WX. Again though with T250 that had normal chassis numbers. I dunno mate just do some thorough checks - the thing is - these CAts are always easy to buy hard to sell . bear that in mind before handing money over. If YOU are happy though then you go for it