The Belfast could take 2 Wessex 2s, 'spooned' side by side, provided they were on air transportation cradles and considerably broken down (e.g. tail rotor pylons, main rotor gearbox and head, main undercarriage legs, all removed). The blades and the removed components could be accommodated either side of the fuselages and on the rear ramp and there was room for enough groundcrew to rebuild the helicopters when they (eventually) arrived at the deployment base. We had a surprise operation sprung on us one night at Odiham in 1967 and got the 2 Wessexes airborne in the Belfast, from a cold start, in 6 hours. And that at a time when the air transportation cradle had only been trialled, not formally released for use.
I always thought the Belfast's weakness was the Tynes. Four Vanguard engines pulling an aircraft that size had to test the patience a bit, hence the 'scurvy' comment out of Gan heading East (a true story, and it didn't go down too well at HQTC Upavon, IIRC). But it was a good bulk lifter and would reach Akrotiri with 2 Wessex.