Surely if you have what you perceive as a bad experience with a dealership over test driving a car, then yes on that count I would deem it reasonable to go elsewhere to buy a 370.
However. you now say you are now not going to buy a 370 period!
If you were serious about buying one you would swallow and go elsewhere.
The bit I dont understand about your post is the relevance to owning a car that in your words
"I have a car that would paste a 370Z in most departments apart from age and upkeep, surely as an owner of two 300ZX and an R33 GT-R with a brand loyalty, I have acted reasonably here"?
Why would you feel the need to bring this up on a 350/370 forum! as the message that is coming across to us is that you feel you are superior by having a car thats 500bhp and will paste a 370z.
Think Kev T and a few others might comment on that!
Hopefully like most Nissan dealerships. Westway are reading this and may comment themselves!
Maybe you both rubbed each other up the wrong way!
However if you are serious about buying from a dealership that will treat you with respect and you don't mind a trip to West London
I can give you a contact.