Thank you for the compliment; we do try to live up to your expectations
You're welcome!
yes, I'm taking a little bit of the mick, as they say. But do you accept the cause of my scepticism on this? I still haven't had a considered response on how such an accurate identification can so often be arrived at from such a short glimpse. All the more so in that last case as it turns out that the closest point of approach was 50m away...
PDR