After pestering @DiamondPerformance for an age on whatsapp I got down to 3000grit wet and dry , a lot of warm soapy water then some cutting compound which I applied by hand.
For an amateur effort its a solid 8 out of 10 and I dont think you would notice the repair unless I pointed it out. Sure the lacquer isnt super glossy but it doesnt catch the eye either!
The offside front pads have been sticking. I noticed it , the MOT station noticed it too.
I have today had the wheel in the air, and removed the caliper, cleaned the piston up and noted the pads were seriously uneven in their wear. The outboard pad was wedged in and took some gentle persuasion to come out. The inboard fitted well.
I have filed a small amount off each “ear” on the sticking pad , and swapped it to inboard.
I have been out for a quick spin and it’s better, not perfect. I suspect I’ll have to check all 4 calipers to ensure they are clear of crud.