Soggy Bottom Boy

I blame my friend who confidently told me that it would be only showers this evening.

Shortly thereafter, there followed a deluge of not-quite-biblical proportions which proceeded to soak me to my very core. When the rain is lashing you, it is not the best time to discover that your waterproof is in fact, not.

However, I was able to snap this shot of I-don't-know-what and so would be very grateful if anyone would be kind enough to confirm? My best guess is some kind of warbler?

Grateful to have had the foresight to wrap the camera up in a plastic carrier bag within the rucksack before marching onward.