Well, on one of my wanderings through the archives of Pathe news I came across a short film of a Centurion tank that was amphibious with more than just a wading screen, it even had propellors at the rear. It so resembles a Duples Drive Sherman its uncanny.
The footage looks to have been shot at MVEE at one of those "showing off the army kit" events that used to be so common.
For the life of me I can not find it again yet alone post a link.
Just thought I would throw it out there as there doesnt seem to have been any prior discussion on the subject.
And for those who are tempted to say "BARV" just stop yourself, this was a gun tank, I do know what a BARV is.
R