If you are funded by a School Scholarship: One of the conditions of your School Scholarship is that you undertake any demonstrating required of you (up to a maximum of 180 hours per year).
If you are funded by another means: You will be paid for demonstrating. The hourly rate is currently set to be £12.89; this is linked to the pay of other University staff. You will also be formally employed by the University on a fixed-term part-time contract, which specifies the hours On appointment, you will receive a contract letter and will be paid on a monthly basis via the University pay-roll system. You will therefore be a University employee. In addition to the hourly rate you will receive holiday pay on a pro-rata basis (one hour holiday pay for every thirteen hours work).
With status come responsibilities. So for example we will of course require you to attend the allocated laboratory sessions in a timely fashion (or to let us know if you are unable to do this), and for you to be well-prepared. Each laboratory has a Laboratory Supervisor and you will be responsible to them. Clearly, with perhaps seventy students in a laboratory session, it is vital that all the allocated demonstrators in the team turn up on time and are in a position to assist the students and mark their work.