I will do all I can to find out and post on this when I can. BUT I assume that existing cars will keep the cover given at time of sale but new cars registered, I think, from April 1st will have the new T's and C's.
I think Rory makes a good point about accounting practices getting stricter and stricter about making provisions for future liabilities. You make a car; think you have made a few hundred of profit but then the accountant says 'ah but if it goes wrong under guarantee it will cost; so we must make an appropriate deduction for that'
And if you offer 30 year rust guarantees, more provisions. And free long term breakdown cover. On it goes. I suppose we have been very lucky with the cover provided up till now.