It is a little early to comment on these sites, however I thought that I had better point out a couple of factors to you, I am sure that you will feed these to the relevant officer.
You will recall that we met last year regarding the Avon Navigation Extension. The Feasibility Study for this is still being refined, however the Study nominates a ribbon of land for the canal to bypass the Sherbourne loop of the Avon which includes GT12, north of Westham Lane, Barford. This means that this land would be excavated to form a canal cutting.

In addition the Study proposes that the Community Land considered for GTalt12 becomes a destination for access to Barford village and is provided with visitor moorings. I doubt if this use will be compatible with a GT site.