Thanks for the replies. Sounds like this is the type of collar we'll be going for now. This place is just great. I'd probably never have bought one just in case they were unsafe. It's great to find out about what has been tried and tested.
Thanks again.
Oh, one more question - I think it was Colin who posted a link for the site where he got his car harness. Unfortunately, I think it got lost in the data loss. Anyone got any ideas which site it was?
Morgan usually goes in the boot but we're going on holiday for a few days and will be in the car quite a lot. He will probably sleep but wanted to have the harness so that he can watch the world go by for some of the time.