And you probably weren't wearing bulky flying gear too.
Nope but I'm 6' tall and at the time was about 260 lbs so my girth simulated the bulk of the Irvin jackets and everything else. For a big airplane, there's bugger all room inside. And the noise of four Merlins on the flight deck, and no ear protection except for foam ear plugs, was unbelievable. You could feel it in you chest.
This is my friend, Mr. Bob Bradley. He completed a full tour as a mid upper gunner on a Lancaster with 576 Sqn, RAF. He proudly wears the Bomber Command Clasp on his Canadian Volunteer Service Medal.