Mum25 Trainee

I understand that as an invigilator I do not pay Class 1 NI even though I correctly pay income tax via PAYE. Does this apply to all formal exams in the educational setting (ie including the ones the institution set themselves) or just externally marked papers?Thank you.

I disposed only of listed shares. Some were full and some part disposals. I used the worksheet for full disposals and attached a computation of the part disposals. My tax demand was based only on the worksheet figures so I phoned to say I need to pay more. I was told to amend my return . The only way I could see to do this was by making a new worksheet with just the part disposals proceeds and losses even though this wasn’t strictly the correct format (but the numbers were right). Was there another way to do this?