Well that was a slog but I made it to the end - first time with a BH Special Maskarade. Thank you for the steer on the pigment / market town, I had looked up all the market towns in Oxfordshire and nothing fitted...
Agreed with the consensus on 2 and 47.
@Brendan, I think in 47 there is a wordplay element as well as the cryptic def, involving "I'm" embedded in a short slang word for drunk.
Cheers all and I hope everyone may have a merry-as-possible Xmas. I wonder if we will get something else special next Friday or Saturday?