Where are all the birds?

I have lived in Dawlish, Devon for seven months but have yet to see a single blue tit, great tit, sparrow or chaffinch in my medium-sized bird-friendly garden. Before living here I lived about three miles away near Teignmouth. There all these birds - except the sparrow - were regular residents/visitors for most of the year, along with a plentiful supply of greenfinches and goldfinches. (I saw only ONE sparrow in  that garden in the ten years I lived there!).

Here in Dawlish I have seen ONE (dead) greenfinch and saw two goldfinches when we first moved here - none since - not even in the cold weather around Christmas. (Yet there are greenfinches a few score of yards away nearer the town as well as a few sparrows in some of the local gardens).

We have had very rare visits from a coal tit, one from a pair of long-tailed tits, a nuthatch once or twice, ditto a wren (before the cold spell) and, once,  a green woodpecker. The only regular residents / visitors are song thrushes, blackbirds, robins, dunnocks and... blackcaps!

We've put out all the usual bird food - sunflower hearts, nyger seed and currants but the currants are the only food that gets taken. the other food is studiously ignored! what am I doing wrong? Or is the lack of some of these birds (the tits, especially) more general?

We did have a quite large flock of redwings during the cold weather but nothing else either common or rare.

Can anyone think why this should be so?

I'm very saddened and mystified.