I second that plea! I'd love to know!
I presumed it was pretty cut and dry with dating it, why would it have an 82 frame number if it's possibly 70's?
I've also chipped some paint off both frame and forks, clean steel underneath, also checked the bb and headtube and no signs of any foreign overspray.
The paintwork really does look pretty special, must have been professional - making identifying it a lot harder.
Is there anything further to check on the bike?
Thanks for your help everybody, Jon