Colin, I bought a Supersport from CC Gatwick two years ago as a 'dealer approved' car. I raised the concern regarding the Titan diff (clunky/noisy) after almost a year of ownership and CC investigated at the annual service and agreed that the diff should be removed and inspected by Road Race Transmission (RRT). This obviously occurred just as the warranty was running out but CC accepted that as I had raised the concern before the end of the warranty, they accepted the full cost of whatever was needed. The following advice from RRT to CC was that a new diff was required and CC removed and replaced a new diff, albeit another Titan, supplied by RRT. It's still clunky/noisy but have been told by Sevens & Classics as well as RRT, that it is operating as expected with no cause to do anything at all. Sounds bloody horrible at low speed and turning. However, as stated either in this thread (or some of the alternatives), I'm keeping a close eye on oil quality and colour as well as resigning myself that the diff will come out this winter for a full inspection by RRT. I agree - there is no way that any repair, service or replacement should be down to you - it's covered under the original warranty as long as you have raised it with CC IN WRITING before the warranty end date. However, note that any replacement diff will not be further covered by your original CC warranty. Note that mine is the standard Sigma and is purely a road car - no track days planned or desired. I'm waiting for someone on this forum to come up with a better alternative than simply driving it and hoping that it doesn't fail catastrophically somewhere. Or I have to bite the bullet at some point and pay for a better solution that doesn't carry that risk. Bloody disgraceful.