If the supply MCB is 16A than any power cable (1.5mm or larger) is fine if not heavily insulated or hot zone and no realistic limit to number of sockets.
But...you are obviously limited to 16A total! Also some larger loads with motors like chop saws, etc, might take enough of a start-up surge to trip a 16A B-curve MCB. Going for a 16A C-curve might be an option but really then you need to do a bit more design and testing.
Ultimately your cable run and loads are limited by one or more of the following:
- Current carrying capacity of the cable (mostly conductor size, but also thermal insulation of its route / installation method)
- Voltage drop (should be less than 5% at max load)
- Fault impedance to disconnect fast enough (usually met if VD met)
For guidance, a 16A circuit on 1.5mm T&E should be limited to 27m (or 15m if C-curve depending on supply Ze, typical TN-S limit). If it is in 2.5mm (more likely as safe for greater range of installation methods) then 45m (or 24m C-curve).