Assuming you have four or less shares (or at least 4 or less named pilots who wish to train), then you can make application to the DfT for permission to carry out this aerial work.
The DfT will require the trust documentation, current insurance certificate, latest annual release to service, the Registration document, Radio Licence and their form completed.
They will provide permission until the earlier of 12 months, 12 months from the release to service or the expiry date of the current insurance.
See Here.