[Juha]

Tony
"The Soviets received Churchill I and II, IIRC."

They got Mk IIIs and IVs, I think. Ie with 6pdr gun. And in all pictures I have seen they had that 20 mm appliqué armour in place. 35 were at Kursk and some were used against Finland in June 44.

"Since the line was advancing those that bogged could be recovered."

Haven't You read the history of 6th Guard Armoured Brigade? According to it rather many of its Churchills bogged down so badly in Reichswald that they were never recovered. Maybe after the war by scrap metal dealers but not by 6th Guards. If you have studied this 35 years it surprising that you don't have knowledge on that.

"The Crocodiles were not used in the set pieces I know about."

Either You have Your own definition to set piece or you have missed a lot of them.

Juha