ok 101 sqn lancs did indeed have 8 crew members, however the extra man was not a "radio operator" he was a "SDO" or "specail duties operator", this extra crew member manned a position behind the wing spar (i think), here he controlled essentailly three radio sets, with these sets the extra crew member who not just spoke german, but could identify most european languages (all he had to do was identify them, speaking them all was not nessisary), would scan the frequencies untill he found a channel believed to be communicating from a german ground controll radar station to a nightfighter, then, as MM said, noise from an engine would be broadcast on this frequency, thus blocking this frequency, because he has three sets, he can block three frequencies at a time. The "ABC" system required the use of 3 large arials (one underneath on the nose, two on top forward of the upper turret), each arial was about 5ft in length, streamlined in section, about 5 inches thick at the base tapering to 2 inches at the top, however this is the only way in which 101 Sqn lancs differ from the norm, they still carried the normal payload and, apart from the SDO, the normal crew...............
101 Sqn was the largest in bomber command, having 41 aircraft at peak strength, due to the fact that they "escorted" all major raids post october 1943, whey were spaced out inside bomber streams to provide the maximum of protection, they did however suffer huge losses...........
this is of course a very brief look at it, if you want any more detail on any of it please ask..........
right, i feel i've made all your knowledge look suitably pathetic, i'm off to bed, and remember, no one can out lanc the lanc............