Which duck species have you already got on your garden list there Ken?
One more to add up here:
32 Green Woodpecker
yaffling away nearby yesterday.
I suppose Wigeon or even C.Scoter might be a consideration? I live equa-distant between two lakes mile either way, and perhaps two miles from the Lee Valley reservoirs.
As you well know Richard no two years are the same, two years ago Tufted was the most frequent flyover duck, last year just 3 records. Mandarin by far is the most frequent, mostly at dusk.