Help...............

Planning a trip to South Uist & Skye so took my 90 in to a local garage for its MOT and service. When I got it back I noticed a shudder coming through steering wheel when I get to about 50 mph. Took it back to garage and they tried to fix but still have problem. They asked me to take to a specialist who could balance the wheels.
Looking for a good garage in Northumberland or North East area who can balance my wheels and check the steering. Any help would be appreciated. Many thanks.

Welcome.

Was there any hint of a shudder before the service & MOT?

I never noticed anything until after service.
Thought they had moved wheels around or lost a balance weight off one of them.
They got them balanced again and tried wheels on different locations, but its still there.