Black, white & yellow bird.

Hi, I’ve just seen 2 birds sitting on a fence & flying off (few seconds of sight only) (November, Brighton)

I’m no expert but I can’t seem to find it anywhere. They looked similar to a wagtail with black and white stripes but rather bigger & had a small faint patch of yellow on neck / breast. 

All the birds I’ve seen online have wayyy too much yellow or are a lot darker. The black and white looked more evenly distributed across the bird. 

Any ideas? I wish I could describe it better but I know I would recognise it straight away if I saw it!!! How annoying lol