Anyone with an allotment?

There is building work on one of the boundaries of our allotment site, our plot is only 1 plot inwards from that boundary. We get this email tonight

People unconnected to the building site or the allotments have been seen accessing our allotment site through the building site in recent days. Naturally, we are very concerned about site security at the moment because of this.

I don't usually even lock my shed. Best go take a look tomorrow see if owt has gone...