Performance was limited on the early Britannia 732s (Basic airframe, -9 engines). For example LTN-CFU-LTN was often a 4-leg day (tech stopping VCE both ways). Two of these aircraft were convertible passenger/freight config. The strengthened floor and cargo door gubbins added an extra tonne to the empty weight so payload capability was inferior to the rest of the fleet. If memory serves:
Typical empty wt: 29T, convertibles (GAXNA & 'NB) 30T
Typical landing wt: 42T (130 pax)
Basic –9 max T/O wt: 49.4T (GAVRL & 'RM) or 53.0T, but sometimes reduced by factors such as runway length, air temp and barometric pressure
Max T/O wt for later Advanced -15 732s was 55.1T, greatly increasing range.