In reply to Simon Pelly: Oh no! That's reminded me of am embarrassing incident 25 years ago, when I was asked to tie some canoes to the top of a jeep. Being a climber, everyone thought I must know my knots. So I botched together a pitiful attempt to tension the canoes to the roof rack. A couple of miles down the road, the canoes slipped off, and Mr. Red face had to watch as Roger (the American hippy) demonstrated his superior knot prowess
If you're reading this, Roger. You may have won the Knot War but don't forget I found the cave..it was ME..you'd given up...we wouldn't have been able to take the kids caving without me, ya hear?
(where's my bottle of whiskey?)