Sacha wrote:
BTW, I understand that CCTV cameras aren't that expensive nowadays and
there might be a handy tree nearby to which to fix it?

We have cameras around our house but you have to have some connection to a
recorder.

I suppose it depends on how remote the allotment is. Does the OP have a
secure shed with eleectricity? (although she could use a battery with an
inverter) She could have a wireless connection back to the recorder. I
also forsee problems with it visible in a tree. If the perpetrator sees it,
would he not destroy it. What a horrible business

If these problems can be overcome, cameras are a good idea.

I do hope the OP finds a resolution. It makes me feel sick to hear of such
wanton destruction