I've found the missing comments :-) I'm enduring a MAJOR spam attack at the moment which is causing no end of problems. The blog therefore decided (can they do that?) to arrange for some comments to be moderated BUT not actually notify me despite the fact I should get e-mails every time a comment is made.
Apologies for inconvenience and PLEASE do comment!
That's a relief - I was starting to get quite offended there that you hadn't approved my comment!
Sorry about that Richard, I have now found your comment and it's up and readable. Thanks