Many thanks for that LarkandWarbler. I have made a note of it.
The necessity of bird-watching is a really good reason for avoiding all forms of housework.
The dust will still be there tomorrow - the birds may not be!
Lucybob, I shouldn't think it will be too long before you see them where you are as Gigrin Farm isn't a million miles from you (as the red kite flies ☺) and they see ones from the Chilterns around there - they can tell by the leg rings.