"Dr Ivan D. Reid" wrote in message
...
Saw a double-decker on the 222 route the other night. I don't
recall seeing one before, is this a new development?

Happens occasionally, presumably when they are short of the usual single
deckers.

There is at least one DD working regularly on the A10. The special liveried
Darts for the A10 are now used randomly on any Uxbridge-based routes.