You could try Bill Langton, he preps race bikes his place is next to Oulton if you want close check out wlracing.com or if you're willing to travel a bit further the obvious choice is Nelly, tried and tested by many on here
My 996R and previous SPS have always gone to Nelly at Cornerspeed. Great service and top bloke.
The Multistrada was bought new from Woods and gets serviced there; they are without doubt by far the best franchised dealer in the North and Andrew is first class.
Over the last 6 years i've tried various other Ducati dealers and its well worth the travel to either Cornerspeed or Woods. I pass several other places to get there which says it all.
Be aware that a lot of service people are quoting nine weeks before they can fit you in at the moment. Makes you wish you'd had it serviced during the winter when they are quiet!