One bird stood out. A female, much larger than the other redpolls, very pale with no brown on her chest/sides/upperparts and a bright white wingbar. Having studied quite a few photos and having read several articles on how to tell the two species apart, I am fairly certain that this bird is a mealy. I only managed a couple of poor shots before the bird flew off but you can clearly see how different it looks from the lesser redpoll.
It's the bird on the right - large and very pale.
If anyone thinks I'm completely wrong, please do get in touch. I do hope it is a mealy...a lifer for me! :)