Picture posting is enabled for all :)
We can't win.
Really sympathise with you over this ignorant dumping. :'( I imagine most sites have experienced this sort of thing especially when a skip is delivered to take away any 'brown rubbish', it is amazing what is supposedly found on site. We know that some items must have come from homes. Maybe not plot holders but perhaps overlooking neighbours who don't miss an opportuntiy for a free tip. Really don't know what the answer to this is. I take your point that if you clear it away then the offender will see this as acceptacle behavoiur and re-offend, but in your case with an open day on the horizon, the last thing you want is rubbish on show. Hope you find out who it is and can have a quiet word with them and that te performance is not repeated. Have a good show :)