Bird ringing

I had a pair of Goldfinches on my bird feeders and noticed one of them had a silver ring on its right leg.

When I zoomed in on the ring I could just about make out ER32 going downwards. I couldn't see the other letters and numbers but I m just curious to find out if anyone knows any information on this bird ...maybe where it came from or about its journey ? 

I live in South East London

Thanks