Sad to hear that Dave has passed away.
He was such a solid character - very helpful and always willing to discuss anything to do with caving, but, with an abrasive sense of humour, he would delight in winding you up, just when you weren't expecting it, even though you really were.
I remember the "Manor" years well, in particular a rigging course where he took a small group of us to finish off his bolts in the Goblin Shaft of Sell Gill - red rings, of course!
He'll be missed by many of us.