Black and White Warbler in East Sussex

I live near Newick in East Sussex and have a birdbath at the bottom of my garden.

I have just been watching a small blakc and white stripped bird.

I did not manage to get a photo but after watching it for a couple of minutes I googled "Small black and white bird UK and the image that came back is that of a Black and White Warbler. I went through all the other images and this was the ONLY one that matched.

I have never seen this here before.

Is this unusual?

The image in the miggle is the one that the bird was most like.
www.allaboutbirds.org/.../id