I looked up and sure enough, the couple I saw had the appearance of people having a look around as prospective new tenants. I wanted to dive away and hide, but smiled and said hello. They were unsure of just what constitutes plot 14, so I showed them around.
It turns out they're the owners of The Priory, a care home in Chippenham and have already agreed to whichever half I'm giving up so that they, the care home staff and residents can take on the plot as their project. The member of staff in charge of this is a Ghurka army wife who intends to run this along the lines of how it would be done in her village in Nepal.
I'm absolutely thrilled at this outcome as it fits in so well with what I've been saying about the need for gardening in care homes. This has worked out so much better than I dared hope and I'm looking forward to meeting all my new neighbours :)