 Edwardes was elected to his father's old seat of Haverfordwest in 1747, a seat he held until 1801, with a brief exception between 1784 and 1786.His tenure as member for Haverfordwest was based on an arrangement with Lord Milford, the member for the Pembrokeshire county constituency, whose family treated Haverfordwest like a pocket borough.Lord Kensington died in 1801.