Hicklin Slade has created a mailpack, which will be sent to 15,000 existing members of the trust, intended to boost donations. The pack features images of indigenous flora and fauna and describes the work the group does and why it needs more funds.
The money raised will go toward projects such as managing woodland for renewable energy and helping to increase numbers of brown hares and black grouse.
The Trust appointed Hicklin Slade earlier this year as part of a strategy to broaden its appeal.