Hi, Margaret,
That mystery bird might be a lesser redpoll. It is hard to tell if it is the right size, but it has a thicker body and shorter tail than the blue tit, so looks bigger. I had a very clear look at its rosy throat this morning (your afternoon if you are in the UK). It has no markings on its back but has a white or buff-coloured breast, and the tail is forked.
Hope you are having a good day - it is brilliantly sunny here but a bit chilly, just above freezing.
Helen
