Geoff P - if it is in person you are talking to Trogg, probably "Sir" would be an excellent idea unless you are also quite large & muscular.
He does have a US mate, MTPVA, who can call him just about anything in complete safety even if in person. But I've fished with MTPVA and he is a large fella too. Large. Good man to have around if your 4x4 gets stuck in the mud.
OTOH, from this distance, I can call him "Bat S**t for Brains" and not be afraid. Not that I would, you understand, but I could. [xx(]