I've recently started putting seed and fatballs out and have seen a couple (maybe more species) that I haven't seen before and don't recognise. Both are similar to sparrows in size. I think one is a finch but not sure, it didn't seem to have the pinkish colour of a chaffinch, but did have (I think) a couple of white stripes along it's flanks. The other has yellowish green upper plumage and a yellow chest. Unfortunately I haven't been able to get any close up pictures.