For my girlfriends car, is there a decent trustworthy place in the west end of newcastle that anyone on here would use?

If Newburn is do-able then JD Motors over the river at Stella (Haugh Lane) near the railway crossing are very fair. I've put four cars a year through there for the last 5 years, all aged 10+ years and only had one failure between them (brake pipes on a '95 Trooper, which they replaced for £60).