It's from an old flower bucket, some offcuts of ply, timber and perspex and a UV LED light off Amazon. Wanted to see if it worked and if we had much in our small garden. I will look at perhaps something a bit bigger and a better light for next summer.
Looking at old maps it doesn't look like there was a church, it appears to be farms and mills that were lost to the lake. One of the old roads and bridges is currently starting to appear at Herons Green layby.