I have a Nikkor 200 - 500 mm lens and the coarse focus has jammed - repair options?

I have a Nikkor 200 - 500 mm lens and the coarse focus for no reason has jammed.

I bought it in lockdown and it's out of warranty.

Is anyone aware of anyone locally in the Stratford-upon-Avon, or as a nationwide trusted repair point who may be able to help?

Thanks for any suggestions / recommendations people may have.

Real-world recommendations are always best BlushThumbsup