Joe, RAF aircraft are not my forte, I was just lucky enough to get a visit to the BBMF thanks to one of the RAF WO's at my unit also being the Load master on the BBMF's C-47. But at a guess, I would say yes, at least after the RAF switched to night bombing. And I say that only because it seems to make sense to have a cockpit that's as dark as possible at night, not only to stop it being seen by the enemy, but I think it would also make it easier for the pilot to see in the dark if he didn't have anything bright around.
But its just a guess.