ah, ok i went to have a look, there was three allotments on different plots:
1. I bumped into an old boy at the gate of the first one, and milked him for what her knew. Basically in this big field was about 4 actual recognisable allotments, the rest of it looked like it had been wild for at least 20 years, and he said most of it had. there were several plots that were owned but never used - one or two of the plots had TREES growing in them, they were so unused, and it takes a while for an Oak to grow to 6 inches diameter at the base.. The local yobbery occasionally burnt down the odd shed for amusement, there was piles of fly tipping, and the far end flooded every winter. You'd need a bulldozer to take the top foot off then a tractor to run across it then again at right angles to stand a sporting chance of getting anywhere with it.
2. was a triangle of land next to a play park. The fence was broken down, and a worn pathway to a gap at the far side indicated the local youth used it as a short cut. There was ONE plot in the 12 that showed some signs of activity, dug, some bags of farmyard manure, but nothing was fenced or marked, it looked like a spare building plot. I suspect anything you planted in there wouldn't last 5 minutes.
3. the last one was the best. surrounded by houses and massive hedges and a river, big high steel gates, as far as can be seen all the plots were in active use. The bit in question was a part that was going to be 5 plots, and had been used for a horse to graze. You'd still need it turning over with something industrial to get going but it was secure, out the way and active.