At the end of a long working week I set off on a UK weekender with three explorer buddies – my usual partner in civil trespass James Kerwin, his girlfriend Jade, and the mysterious Slaaaayaaa (aka Ben). Our first stop was to rendezvous in London for a brief revisit (for me) of Finsbury Park reservoir. The plan after that was to drive through the night to deepest darkest Wales in order to explore an amazing old quarry filled with scrap…