It looks great - though, straw rather than yellow - and (while probably impossible to replicate in 00 scale) it was only a on-inch straw line, and worse, edged both sides in a 1/4 inch red line!
The RPSI's Mk 2 livery lining, with a yellow line, and a single, separate red line, was based on the notion that this livery should not be actual UTA, but should look reminiscent of it on dark green carriages. Thus, the RPSI's own livery, with yellow replacing straw, and different thickness and style of lining.
But I digress! Darius - as always - truly amazing work. That Dapol yoke looks just like the aluminium-clad "upgrades" of old (originally panelled) NCC stock in the 1960s.