Applying for DBS in the UK and need help

As I said, I am applying for a DBS in the UK, and the only document I can provide in the Section 2 Group 2b Documentary Evidence Sheet is a letter from my headteacher, as I am in full time education, and I was wondering what was needed in the letter, or would my headteacher already know this? I need an answer quite urgently, so any help is greatly appreciated
Asked Feb 14, 2017
Edited Feb 14, 2017

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