Well then, you have indeed been busy Cliff... I was going to send you an email but bugger it, I'll post the question on here.
A Lancaster pilot's logbook that I have a copy of has an interesting comment and I was wondering if your Lanc systems knowledge might be able to supply an answer. He was on the infamous Nuremburg raid of March 1944, and his logbook entry for that flight reads as follows:
Operations - NURNBERG. Moon very bright and defences very active. Losses high. Bombed Wanganuis because of cloud. No troubles from defences. Had to use "M" blower. Petrol 1900.
The question: What's an 'M' blower? I spoke to a 115 Sqn pilot yesterday and he had no idea so I thought a flight engineer might be able to figure it out!
Best wishes,
Adam