Cause...

...and effect...

The gate at the bottom of the hill has been lying on the ground for a few months - ever since they started tree felling.   Rubbish is often left at the parking area so it was only a matter of time before someone decided going further in would be a good dumping ground!  Not sure what the last image represents!  Google suggests a hanging coupe is a coat rack or a coupe car hanging from a wall...

I have contacted Tillhill Forestry asking them to fix the gate before more stuff gets dumped!