I had an allotment at that site, on the lower one
It was in a similar state, I did get in some help to clear some of it, and got a load of manure to add to it, however because of the extreme slope of the plot, I found it was flooded most of winter and then dry as a bone in summer. Also a small stream seems to run thru some plots, I actually had a pond at the bottom
In the end, after all that work, I gave it up. I don't think there's any waiting list there, but try to get one on the top site