No new roads

[Rjk]

So when does my petrol driven Ford c max become illegal ?

Its only done 50 k , I want another 100 out of it 😫

you'll be fine, they have almost 15 years to carry on making new petrol cars, and then they'll probably not do anything with cars already on the road for many years. Your Cmax will be long gone by the time they start taking them off the roads.