https://www.slab.org.uk/guidance/supporting-documentation-to-submit-with-an-account/
To help us assess your account, please send us, where appropriate, the following with your account. Please note, productions do not require to be submitted if the account contains sufficient detail. However, these may be requested in the event that we require sight of these to justify a charge.
You should supply:
You should supply:
You should supply:
You should supply: