The letter says: "I do not believe that the almost £800,000 of complementary measures that the SWLEP was funding should be called automatically into question by the suspension of the ETRO.
"Neither should the bulk of the complementary measures due to be funded from Wiltshire Council. These proposals, perhaps with the exception of the parklets and making the bus gates permanent, are not in any way technically dependent on the ETRO being in place.
"Indeed, given that the complementary measures are more permanent investments than the LTZ scheme which was only experimental and time-limited, the former could never be said to be contingent on the latter."