How do I attract finches to my garden?

Hi, I have a bird table and various hangers and trays full of seeds, suet, dried fruit, scraps and cheese.  I attract a variety of birds - jays, magpies, woodpigeons, doves, pheasants, blackcaps, blue tits, great tits, long tailed tits, blackbirds, robins, wagtails, grey wagtails but no finches of any discription?  Could anyone suggest what food they like that might tempt them to the table?  Many thanks :)