It is a murky old world with warranties and British manufacturers. Some do, and some don't, and some will if you pressure them.
All I can suggest is contact the manufacturer direct and if they play 'naughty' suggest that a letter to the caravan press is on the way. It may not do any good, but would make yyou feel better. Also, if major faults do appear, that are not the result of negligence, you may have claims for recompense under the Sale of Goods Act. If this happens, and if you have a tame lawyer get him/her to put in a letter on headed paper, you never know they may decide to pay you off rather than risk going to Court.
The Cris deal is pretty straightforward, you are merely paying to have the registration transferred, if it is only