When you start work for a new employer you will be asked for a P45 tax form, which your previous employer should have sent to you.
If you do not have this, or have not worked before, you will be asked to complete a P46 tax form.
You should complete Section one, state your current circumstances by indicating which one of the three statements apply to you, sign and date it and send the form to the Payroll Office. They will allocate you a tax code according to the information you have provided and inform HMRC that you have commenced employment with the College.
HMRC will instruct Payroll if the tax code needs to be amended.