Ours are separated in to two plots per each fenced area. We are bordered by a private lane with only one entrance, the gates to each pair of plots are off this lane, and a syke which runs the length of a racecouse behind the allotments. There are hedges all along the bank of the syke. The plots are around 15' wide, 100' long. Its classed as a 'medium size plot' There is a path between the two plots. Each plot has a shared gate, and a tap.
The people who have somehow managed to get a 'double plot', have both sides of the path, and are the only ones who use their gate/tap.
At least two of the allotmenteers have worked the two plots as one being theirs and one being a family member. One chap has 'his plot', and works the neighbouring plot 'for his friend', who still retains the tenancy. (Who pays the rent I'm not sure, and havent asked)
The plot next to ours and direct neighbour is a double plot, the chap is lovely and chats/offers plants equipment etc, but there's something that puts me off asking how he got his double plot.
There is another chap who has two plots but are not adjoining, he wanders up and down the lane from plot to plot, depending on what his tasks are for the day, he says he has one plot and the other is his daughter's.(We've never seen his daughter lol)
My partner got his plot after being on the waiting list 3 years, I've had my name down for around one year and am number 60 on the waiting list- I've moved up 4 spots since last August.
I dont think you would be given two plots under one name.
There are about 6 plots out of 50 that are neglected, including our neighbour's. Its very frustrating to see plots going to weed and dereliction when there's a waiting list.
Our rules are that the land must be evidently used for veg, fruit ,flowers, grass (does couch grass count?!) on annual inspection.