I have my name down for one in blue with full yellow ends and by coincidence, Heljan are doing that version as 829 Magpie, which is what I was going to do anyway!
It's the only one I can say with certainty that I saw, as it appeared at a Great Western Society open day circa 1971/1972.
I'd also like one in blue, with small yellow panels, but I'll have to see how the finances are doing when the time comes.
Regards
Dan