Bags of authenticity for sure, Matt -- your Raven fairly shouts out, "Been there, done that, and then some."
The advice above pretty much covers the waterfront -- the response from Forum readers & contributors is always so rich!
A couple of additional notes on what's been said, drawn on my more limited experience, mainly in restoring a very rusty old ex-comp AJS scrambler:
1) Where you have patches of rust like the one on the chainstay (from the kickstand), I'd suggest scraping and/or sanding the edges of the paint away, to see if the rust has gone beyond what's visible.
2) As a rust remover, I've found this product to be effective, and
much easier to work with than acids:
http://evaporust.ca/ Evapo-Rust is made in the USA, and is sold here in Canada, but I dunno if one can get it in the UK. (Dan, do you know about it?)
3) There is one obvious "but" for your use, however: This stuff works best if you immerse the part(s) in the liquid. I've found that it does work if liberally applied with a brush.
I can't find a list of ingredients, either. (Patent-related issue?) The website has information on its toxic qualities and safety procedures, as well as a comparison between Evapo-Rust and other rust removers.
Good luck in any case, and enjoy your prep for Sri Lanka!