Welcome to the OC
It's great to have another NW owner.
I'm based in Manchester.
For the past 14 years the guys at Lockwood and Greenwood have been doing all the servicing and repairs on my 350z.
Quite far from you but seeing as you asked...
They are a family run independent garage who way back in the days were a Nissan and Subaru dealer but then went independent.
I actually found them through this very forum as they were used by alot of members here.
Often see a zed or two when when I go which is always nice.
I wouldn't put them on a par with places like Horsham or Abbey Motorsports.
But their prices are very reasonable and they've worked on more zeds than any main dealer for sure.
https://www.lockwoodandgreenwood.co.uk/service/
If booking in advance you get a free courtesy car albeit an old Micra or Aygo