Hi, pipme, Yes you can use any dealer for warranty and servicing,
my car came direct from Benfield Motors Nissan dealer, Newcastle (Can be found on web search). All was arranged by uk-car-discount and arrive at my home. Yes we have found nissans always reliable, my sons Primera has over 130,000 on the clock with no problems.
Regards, Dave.
PS
We often holiday in Somerset nice and flat for cycling.