Last year there was a channel type wagtail in fields adjacent to Dairy Farm Road. I say "channel type" because it wasn't a classic, having yellowy / green ear coverts. I didn't see that bird but yesterday it was seen again along the same stretch of Dairy Farm Road so I decided to call in for a look today.
Since channel wagtail is a yellow x blue-headed hybrid then I suppose that any combination of their genes constitutes a channel wagtail. In this case it may be a second or third generation hybrid, in other words perhaps one of its grandparents was a blue-headed wagtail but the blue-headed genes have been watered down further by it's parents being channel x yellow.
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