Hi,
I live in Nottingham and I can understand your reluctance to use the local dealers. I can recommend 2 places that I have used in the past.
RBM Service, Main Rd , Watnall
Jack F Hopewell, Traffic Street (near city centre)
If you live on the Kegworth side of Nottingham - JCS Kegworth might be worth a try. I havn't used JCS but I have heard good reports from others.