Not quite correct - you're not locked into the dealer network to maintain warranty, just need to have the car serviced to manufacturer's schedule and standards.
So if someone wants to save a bit of cash after the first free service then they are quite within their rights to do so. Mind though, you may get some wriggling if you do come to claim, especially if it's expensive, as the OEM may want you to prove that everything has been done to schedule and standard.
Yes you are correct, I perhaps did not explain myself well enough.... they chap said that he would take the first service and then ''look after it himself'' now I have no idea if he has his own Garage business or whatever but it makes it sound like (and I'm probably/possibly wrong here) I will deal with it myself at home...type thing. And with regard to a non franchise dealer or garage being up to ''spec'' I bet it will be down to the owner to be able to prove it...... leading very swiftly to a claim rejection....IMHO. Call me a cynic but it will all be too late and very expensive if it all goes S**T shaped.