[retree]

It's true, my college tenancy agreement explicitly says "The student agrees ... not to use the room for any professional trade or business."

Not only businesses, but any jobs are forbidden at Cambridge as well. If you're not allowed to work behind a bar for minimum wage, it's sort of implied that they're hardly going to look kindly upon you running a business are they?

[auxbuss]

But I bet you are allowed investments, sit on boards, and draw funds from a trust. If so, what a horrible throw back to ancient times. Are you sanctioned to work during vacations?

While creative accountancy can sidestep some of your restrictions -- say, pay yourself a dividend, take a director's loan -- this hardly solves the entrepreneurial issue at hand. Unless, of course, Cambridge students are expected to legitimately subvert the regulations, thereby preparing themselves for a lifetime of sailing close to the wind :)