The BBC's World Service and non-UK coverage is generally pretty fantastic, but unfortunately they can no longer be trusted for anything related to the UK, speaking as a Brit.

By nature of their primary funding source (a "tax" levied on those who watch TV in the UK through the government, which thus controls their purse strings), they tend to be very soft on whoever the governing party is, especially at present. For one, Laura Kuenssberg, their political editor, has had a lot of allegations of bias against the current opposition party, some of which have been upheld in enquiries. She's also ended up serving as an unofficial mouthpiece for leaks from the conservative party on a number of occasions, parroting party talking points uncritically.