how do you cambridge students find work in their weeks off? - offer holder concerns

hi all,
i'm an undergraduate offer holder and have some serious financial concerns about going to cambridge. my only option to afford it is to find a job during the time off, but i'm not sure about the logistics of it. how do you find a job for the 6 weeks off and then leave? how long do you spend looking for a job in term time? what sorts of jobs would be available? would employers want to hire you knowing you're not there to stay (particularly when the uni holiday doesn't match seasonal job offers)?