Doh!
Not Boddington, I'm on mud, but there are rocks less than 16.764mm beneath ground level; you can sometimes weave a peg through, storm poles make me speak funny words .
Trouble is I rarely use a brolly, so haven't developed a knack for using one (showing how dumb I am ). When I have used one, it's normally on plain simple mud where you can get pegs and stuff in.