We have been feeding only sunflower seeds (whole) and we have a steady swarm of:
Great Tits, Blue Tits, Coal Tits, Marsh Tits, an occasional Crested Tit, House and Tree Sparrows, Greenfinches, Chaffinches, who never come to the feeder but cluster around the base picking up what the Sparrows flick down, many Hawfinches, though fewer of late, Nuthatches, some Woodpeckers, mostly Middle Spotted, two Wood Pigeons, whom we scare off, and a Squirrel now and then. Right out our dining room window. Who needs TV? A couple of scoops of seeds before meals and we have constant entertainment.