Well depends if you wish to travel I've been to Atkin Motor Engineers at Malton for my P2 (give forum discount) plus Chris is a 350 zed owner and his dad has an older version plus you get an authorised Nissan stamp in yer book.
My Zed hadn't had a 'proper' service on his books (nissan) for 1/1/2 years so I wanted guys who knew the cars. I also wanted guys who wouldn't charge for an internet search how to fix things (ie knew my 'little baby ' and could deliver in the day (e.g. unexpected parts etc).
It was a good move for me. P1 might be done locally and is quite simple. i can't say. Depends if you want an once over.
I am much happier now with my Zed and also the a to attention about looking after performance cars at what appears a normal garage.
You don't want the cheapest service but safest and reliable imo.
Money is a factor but a performance engine will always need some upkeep (premium food) (oil, fuel etc).
I was very happy anything I asked about was addressed and my zed feels like he was seriously looked after.
Zeb now has a handbrake that works; a full service; adjusted clutch and brakes that are just ace (if a brembo squeak but normal if very hot <grins>).
I was a happier bunny driving home and could still see the difference a week later.
Deb.