If you look at the second picture, the Cent behind has got the L7 105 gun. I’ve not seen that camouflage before on a Cent, can’t be classed as BATUS as I don’t think Centurion Gun tanks went out there.I've got a straight Mk 5, which from what I have read was manufactured from 1949 believe it or not. I'm doing a Mk5/2 which got the L7 gun, which from what I have seen, appears to have been fitted from 1958. Mk 5/2s were around in 1964/65 ish - again from what I've picked up.
Dates and mods to Cents creating new MKs are all a bit vague from what I've seen so far.