Hope this is the correct section. Sorry if not!

Purchased a focus st225 st2 Sunday and came with 3 months warranty from warrantywise, just had wheels off to paint calipers and noticed it has a split cv boot. Would this be covered? I am comfortable doing it myself but the cars immaculate and I don't really want to mess if I can help it.

Consumer law states that any fault that appears on a car within 6 months of sale was either present or developing at the point of sale, and must be rectified by the selling dealer.  This is somewhat set against the value of the car - you won t get an engine rebuild on a 20 year old Mondeo that cost you £300, but I'm guessing you paid a good sum for your ST, so the regulation would apply.  Return it to the seller.

Warranty wise will probably tell you that a CV boot that is found split on a Thursday will have been split 4 days previously on the Sunday, and won't cough.

As an aside, that's a risky car to buy without a very thorough pre purchase inspection.  I'd be worried what else had been overlooked.  It also speaks volumes for the lack of prep that was done on the car prior to sale.