Just to update, the guys at Custom brakes in Sheffield were fantastic. I dropped off the brake band at 10 am and they rang to say I could collect it at 3pm.
Made a fabulous job, grit blasting the friction surfaces, heat bonding a new lining in place and getting the unit ready to refit.
They said if it has friction surfaces we can refurbish it. No matter how big or small.
No connection to them but heartily recommend them of you need friction linings sorting out.
Regards, plasma.