Chaffinch

It is caused by a parasite. I found this info which explains it better than I can

"Chaffinches are often seen with a parasitic condition known as bumble foot or a fungal attack called 'fur foot'. The infection is not directly fatal but it can cause a loss of agility and make the individual vulnerable to predators. Advanced infections can cause the loss of toes but there is evidence that the birds can recover naturally. Unfortunately, there is no way of treating wild birds even though there are treatments available for captive birds. "

I agree, that close up is enviable, Merlin

As for the foot, WF has said it all, i saw one of the finches with it last year, can't remember which type but it's definately a common condition for the species

it's a great closeup Merlin, there seems to be a few viruses hitting our birds lately

Great photos Merlin, but its sad to see its infected feet. I'm glad you were able to rescue it

Lovely pics. Merlin, glad it recovered, you've had birds there with the same foot conditition before haven't you. I've never seen it on any birds here only the similar thing which pigeons suffer from, I always feel really sorry for them when you see them limping around.