Some interesting redpolls have been passing through Bardsey of late (click here and then on "Latest Wildlife Sightings", scroll down for photos and discussion between 10th and 18th April); there are also reports of similar looking birds from Somerset (see here). On Bardsey the birds are being reported as "Common Redpoll" and/or flammea, whilst rostrata is mooted in Somerset. Around this time last year, I visited Tring in an attempt to bottom out just how much of a minefield subspecific redpoll identification really is,... conclusion - it's a total bastard. To continue with the metaphor, if you can imagine a minefield in a walled maze within which every mine is wired up to two nail bombs (one named 'phenotype', the other 'genotype') embedded opposite each other in the walls, one at head height, the other roughly aligned to the average birder's groin, then you get an idea of how tricky the identification of these streaky little cardueline blighters can be - proceed with extreme caution or, even better, don't proceed at all.
However, just for the hell of it, I did take a few pictures of pseudo-randomly selected samples of cabaret, flammea, islandica and rostrata and, just in case they might prove of interest, present them here for your perusal and delectation,... [NB. click on the images for larger versions,... or squint if you prefer.]