Red Kites, I believe were once quite rare and I heard in the south they were most likely to be seen around the Chiltern Hill, Bucks/Oxfordshire borders. Their numbers have grown, my friend who lives on the Surrey/Hants borders tells me they are now very prolific in her area.
Haven't seen any where I live but we do have the vividly green, squawky loud Parakeets, having escaped when they were filming "The African Queen" at a nearby film studio, or so one of the story goes. Well they must have come from somewhere because they aren't indigenous but have obviously adapted to our climate.