In Chiswick this morning, I saw an eastbound Piccadilly Line train
(73ts) painted red all over except the doors which were light blue. The
red was a bit lighter and less saturated than standard LU red. The
other day I glimpsed the roof of a Piccadilly Line train which was
painted the same light blue, so perhaps that was the same train
(couldn't see the roof this morning).

I was some distance away, but there appeared to be no logos or other
writing on the train to indicate what these odd colours were for.
Anyone know?

--
Richard J.
(to e-mail me, swap uk and yon in address)