There have been a lot of allotment break-ins recently, they are happening all over the country, including here is Stockport.
Please be vigilant and ensure you leave nothing of value on your plot. If you are an unfortunate victim, please report it to the Police and insist on a crime number.
The advantage of having a crime number is that it is a matter of record and helps trace what crimes are happening, which areas should have increased oversight and which recorded crimes cannot be attended to. Would also strongly suggest that you register what has happened with your Secretary, so that the committee can build an accurate record of what is happening on your site.