The consumer board has 10 slots - no idea what the main breaker amperage is, but am guessing that it is more of a question of what tools are run, not how many sockets there are - an empty socket using no amps?!
I know that my library has 24 plugs (12 doubles) and then a further 24 (12 doubles) in the cupboard we use for my computers / servers - all run off one circuit and no issues... so I suspect that 49 doubles run across a minimum of 4 circuits will not be too excessive! Everything is being put in by pros and signed off correctly - all to the latest spec. with RCDs on every circuit and surge protection across the whole lot - belt and braces approach!