Cheers Rich, good advice. Looking at the caliper paint it's bit bit too bright (to the orange side of Red if the cap is right).
So Plan B right now is finish off with wire-wool / scotchbrite , de-greaser then a wash and dry, mask up, wipe down with a tac cloth, then a high temp primer?
I guess as this stage almost any paint would be Ok as it is now painting over the primer? So maybe a high temp paint or find a close ish match in a normal can (Cheers I'll check the cans you left me)
Unless there are any other words of wisdom......