Frame Repair

I can recommend John Hand Racing but he is in Dorset - search JHR on facebook. 

or here https://www.facebook.com/profile.php?id=100050486261659

Dan

If you fancy a drive up to Widnes Ian Bain is your man.
He is a professional bike restorer, bike racer, mostly Norton's such as a C1, Manx etc, pattern maker, castings, frame repairer. An all round good bloke my go to chap for the stuff that I haven't the equipment to enable me to sort out.
His prices are V reasonable worth a call if your interested.

My go to place is Maidstone Motoliner in Ayelsford, Kent.  They have now done three frames for me including a featherbed and a set of fork yokes. Their work is exemplary and I can't recommend them enough.
Might be a bit of a trek for you though.

https://motoliner.com/frame-straightening/

John Hand is highly recommended. No website, go via Facebook etc. He has attended to P11 frames. NMM may point you in right direction, worth a try. Norman White did my P11 Lower Frame Rail, but retired now. What exactly is wrong? You will get there in the end. Cheers Andy