Thanks for the responses, folks. Yes, PM is ‘personal message’, and can be of great assistance, should one wish to discuss with just one person, say, the minutiae of a particular subject, and so avoiding being a bore to other members on the forum. I’d actually also prefer not to have to use F/book if there’s a choice – and instead use an internal AOC facility which merely draws upon the fact that AOC will have all members’ Email details. The TR Register, of which l’m also a member, uses this latter system – and it works very nicely. Best, Tim.