What did I just see?!

I have just seen on my sunflower heart feeder a vividly pinky-red bird - the same sort of colour as when you get an Indian takeaway! I have looked at possibilities and thought maybe bullfinch or crossbill (although I live in the wrong part of the country for the latter) but I am still not sure. The colours on Google Images don't seem as bright as on the RSPB illustrations. I began to doubt myself and thought maybe it was just a robin or a chaffinch but I know that the colour caught my eye and startled me as I was going to put a packet of Mini Eggs in the cupboard - I wasn't looking out for birds so this must have been bright to catch my attention through the window. Unfortunately by the time I had fetched my binoculars it had gone! I will keep my eyes open to see if it returns, but thought I would ask if anyone knew what it was likely to be.