Glos Guy, they are known as Mild Hybrids. The electric motor/generator replaces the starter motor and along with the battery makes a good job of stop/start, moving the car off from rest using electricity. I can’t speak about any fuel saving but from two I’ve been in, they are very quiet, smooth and civilised in town traffic. I like them.
Thanks Wigwam. It’s good to know that I was on the right track! I think that a self charging hybrid might be the best for my daughter as she doesn’t have the ability to charge at home, but I haven’t really started looking properly yet, so all info is appreciated.