moving cu

[12345aob]

Hi chaps, I've been asked to move a cu from behind the front door at floor level in an old terrace to the basement. there only 5 circuits.

my question is would you guys crimp the cables or use din mounted terminals or other? (give us a link please)

also where would you buy a 6" low voltage extractor fan with upto 20 mins run over ?( builder needs this in his life!)