Jackdaw
Coloeus monedula
Variously known as Jack; Daw; Caddaw; Caddy/Caddy (from Norfolk, so clearly correct); Cardaw. In Scotland was called Kae; Ka or Ka wattie and in Holland as Kauw. As with many birds in the UK it is associated with rain (yes it rains a lot here, so good chances of that one working out). In Wells it was said " whenever a jackdaw has been seen on one of the vanes of the cathedral tower we shall have rain within twenty-four hours", and in Norwich there is a rhyme
" When three daws are seen on St. Peters vane together,
Then we're sure to have bad weather "
Apparently, seeing just one alone was back luck, and a flight of Jackdaws down the chimney was thought to portend death of one of the inmates of the house (and a sh..load of soot on the floor I imagine). They do have something of a reputation when it comes to nesting on top of chimneys, I assume they just enjoy the warmth, certainly I watched local birds competing to perch on the rim of an 'active' chimney-pot.
Well, all that aside they are an intelligent, active, gregarious, and noisy species, always seeming to have something to say to each other, perhaps it's "why do you always stink of bloody smoke?" I like them, a lot. We have a large roost (colony) in trees close by, and I find their constant chatting cheerful beyond measure. The collective noun for a group is apparently a 'clattering', I'd prefer a 'chattering', but I don't get to decide such things.