Same here - we definitely were not allowed to sell any of our produce at all, nor were we allowed to keep hens, pigeons, rabbits or any other animals. Dogs were OK if you kept them on your own allotment. We were not allowed to grow flowers though, except a single line along the front of the plot.
The problem with those squares of raised beds is that in some areas they are planted up specifically for sharing with anyone passing - 'help yourself to herbs/salad leaves/tomatoes' - so thieves might not necessarily know they're thieving. Just after we left our old allotments they erected high, strong fencing all around, industrial stuff, designed to keep the casual thief out. I've no idea if it worked or not or if it served as a temptation. When I was there, we planted 3 times what we wanted to crop - one for the birds and rabbits, one for us and one for the tealeaves. That worked well. In fact thievery wasn't too bad, and if you got your stuff nicked then someone would have surplus to share. I think it depends very much on the site and if there are people working there most of the day, or not.
Same with Round-up. People did have some horrible concoctions in their sheds but we weren't allowed to spray. I had more damage caused to my smallholding by a careless neighbour spraying weedkiiler on his grazing than ever at the allotments.
Anyway I think there is still total apathy in my local area for allotments, unless it's as I wondered, that they all have gardens being a country area.