Some help with a classic

That's an interesting one, in all fairness no one ever put codes on paint in that era, even in the eighties non was put on even the big four! I became a spray painter in 1981 and always had my heart in bikes but never could find any info no matter what. It's going to be a case of taking your tank to a Autopaint supplier as most stockists are very advanced these days.

 

Tigs' got the right idea, take a side panel, same colour I beleive, down to an auto paint supplier and they can "scan" it and come up with a match.
These lot helped me out when I was spraying my lid
L E Went
52-56 Burlington Road
New Malden,
Surrey
KT3 4NU
Tel: 020 8949 0626
fax 020 8715 1116
Not too far from you and J&s accessories are just down the road so you can browse some bike gear while your down there

 

Yo Jo, as above, and/or RS paints, they say Kingfisher Blue and Silver Sheen and will sell them :-
http://www.rsbikepaint.com/en-gb/colours.php

also if you search the Technical Forum on here there is a list for Triumph paint codes