Gondor Let's Off Steam

[NARSES2]

Probably best to go direct to them Alistair. I can't remember where I got mine from. It was either a show, unlikely, or in Airfix Magazine ?

[Rheged]

You don't HAVE to paint it LMS Crimson Lake, this is WhiffWorld, remember, and maybe the LMS DIDN'T take over the Caledonian after all?

I agree with Kit.   Paint it however you like!    I seem to remember that in 1948, the newly established BR did experiment with several possible colours for their express engines. The BTC published a series of Temporary Painting Schedules for its inherited motive power in late 1948 covering these experimental liveries.   They eventually settled on Brunswick Green, but Cally Blue was another contender.

Potentially a rather subtle Whiff......the BR "lion on a unicycle" motif, "BRITISH RAILWAYS"  lettering ,  and Caledonian Blue livery with (according to the BTC 1948 document)red, cream and grey lining  and ALL justifiable by reference to British Transport Commission official specifications!

Further data here:-    https://twsmedia.co.uk/2020/08/15/british-railways-first-locomotive-liveries/

[Gondor]

Oh that is very usful and would work out well on something like "Evening Star" or "Biggin Hill" kits that I have, maybe RAF Blue for the "Biggin Hill" though 

Gondor

[Steel Penguin]

or be bl**dy minded and paint it brown....  Crimson lake ( due to it being a lake) will change colour with UV exposure, the ( manganese compound if i remember correctly) end is not crimson   
and I'm not going down that rabbit hole with my Friend who used to QC paint, it more boring than watching paint dry ( which was part of his job)