Yeah as everyone has said they are redkites. hundreds if not thousands round my way because the first breeding pair in south england was released by the owner of the Wormsley estate literally a mile from my house about 220-30 years ago.
great looking birds but you really dont want to be in the way when one takes a shit because its f*****g huge. one dented the lid of my weelie bin a few weeks ago and one shat on my mates car and smashed the windscreen.
and yes your right they are scavengers and will only hunt if they REALLY need to but even then they will only take mice and small rats,