DaveH and RobE
Quick evening trip before the pub meet. After a bit of chin wagging we came up with a plan. We decided to avoid the big boulder which is stopping us from following the water, as this would lead to complications with the current scaffolding. Therefore we've started tunneling through the bouldery clay to the right, with the aim of following under the roof until we reach the water again.
Unfortunately the clay is really tough to dig, the boulders are bigger than expected, and the roof seems to have disappeared. Slow progress, but at least we've now got direction.