It is not known how St. Mawes came to return Members for the 1563 Parliament. Oliver Carminowe and Edmund Sexton, along with MPs from five other boroughs, were requested (22 Jan. 1563) to produce letters patent justifying their presence in the House. Whether they did or not is unknown.
In 1584 the return was made out at Lostwithiel, the administrative centre of the duchy of Cornwall. This had not been an uncommon practice in the second half of the fifteenth century. In 1478 for example, all the returns for the Cornish boroughs were made out in Lostwithiel. The returns for 1586 and 1598 are missing but it would seem probable that, at least from 1589 onwards, St. Mawes conformed to the current Cornish practice of making a separate return for each of its Members. Furthermore in 1589, as at Helston, the returns are unusual, in that they are made out between the ‘mayor’ and inhabitants on the one part and the Member chosen on the other part; the sheriff is not mentioned. The 1601 election produced a different irregularity: the return, which mentions only the burgesses, but not the ‘mayor’ or portreeve, is endorsed by the sheriff with the remark ‘I have sealed the counterpart of this indenture and have allowed of this’.
