@Edo - The photographs of the 121s on websites didn't do the early liveried versions real justice, they look way better in the flesh. As per Wrenneire's post above, if the full range is available at the Bray show it'd be worth going - it will eliminate any doubts some people have about the grey livery, think it shows off all the details of the prototype at it's best. Same with the As, I only had eyes for the EMD engined As until I saw the Crossley versions at the last Annual Railway Exhibition in 2019. I think that the As as they appeared originally have a bit more character than the later up-rated versions.