Black Redstart (Phoenicurus ochruros)
This is a very rare bird indeed in the UK, with only between 50 & 100 breeding pairs, joined by no more than 500 migrant individuals, so you can imagine my delight and surprise when i saw the flash of that tell-tale red tail.
Luckily, I managed a little video before it flew off, but I'll be looking for it again this week, in case its passing through.

The Black Redstart "Phoenicurus ochruros" is a small passerine bird in the redstart genus "Phoenicurus". Like its relatives, it was formerly classed as a member of the Thrush family, but is now known to be an Old World flycatcher.
Similar species: Passerines
By Philip Booker
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Uploaded Dec 15, 2020. Captured Dec 15, 2020 14:52 in Roedean Cafe, Marine Dr, Brighton BN2 5RL, UK.