I put in a four hour session with the digger at the wheel pit today. I have managed to clear a lot of the debris from the slope leading to the tunnel entrance and evened out a safe pathway from near the road (good enough for wheelbarrows etc) to the entrance to the tunnel. It may be worth considering some hardcore/ gravel to help prevent the entrance slope becoming muddy in times of rain. There is a bit of bad news and that is that there has been another dumping of used tyres but this time they are all in the bottom of the pit so they will have to be cleared as well as the existing rubbish/ spoil.
I hope to be able to do a similar stint there tomorrow.