Winter losses

Every year i think about how i can get my bee colonys through the winter , every year the challanges are different as weather patterns are changable , we are well into february and here in hampshire the winter has been rather wet with a few weeks with prolonged daily temperatures below freezing,

Today its sunny the bees are flying and bringing in pollen , of the 17 colonys there. Are 2 with no activity , clearly there is a problem