Saw a bird yesterday, don't know what it was

Anonymous
Anonymous

We were walking in the edge of woodland adjacent to wide open fields. Normally see Buzzards circling there but not yesterday (too wet & windy). I nearly fell in the mud & my other half & the kids were hysterical. Then due to all of the noise a blackbird and another similar sized bird flew off. It was brown flecked on the upper body whith a bright yellow underside as it tilted, flew really quickly into dense undergrowth. The yellow patch was quite large enough to make me notice it.

I'm not really up on the more unusual birds as I don't really get to go out into the countryside much. I only know the more common garden birds. Just wondering what it could be.