You could try sunflower hearts, this attracts all the finches, and the bits and peices they drop attract the ground feeding birds. We also live on an estate and get loads of birds, we fill our feeder daily. You could try moving your bird table to a different position until you find one they like. We also feed blackbirds on the patio with sultanas and chopped up cheese. Have you got a bird bath? they do like water. Good luck they are a joy to watch, we have about 8 gold finches on our feeder and tree at the moment.