What are these pretty little birds in my garden?

Hi

I have recently put out Milk Thistle in the garden along with feeding seeds.  This has attracted two little birds with red and white stripey heads, a creamy coloured beak, a light brown and cream chest and  yellow and brown wings.  They are about the size of little tits and appear to like travelling in two's and one sits either side of the feeder.  Can anyone please enlighten me to what these pretty little birds are?  When they look at you they look almost like a penguin!

Thanks for you help.