[danw1979]

Almost all permanent employment contracts for professional positions in the UK have a “mutuality of obligation” clause which forbids the employee from working for another company at the same time.

Contractors usually don’t have this, which is why it’s perfectly legal for them to run two or three concurrent gigs, but when I’ve engaged a a “full time” contractor who is doing this, their performance - the amount they get done vs what is expected given their day rate - is terrible.