After my three years at King's, I took a place on the graduate recruitment scheme at the Home Office, and then worked as an operations analyst at an investment bank. Philosophy didn't directly help with getting or doing either of those jobs, but it was generally well respected (by some, at least; although there are always others who will denigrate philosophy, generally those with no understanding of it!) You will always be in competition for jobs against people with more 'relevant' degrees - business, law, economics - but if you have a passion for philosophy, your enthusiasm will shine through in interviews, and (in my experience!) that's as valuable as a vocational degree.
One big advantage of philosophy at London University is that lectures are intercollegiate, based at King's, UCL, LSE and Birkbeck, which helps you feel integrated into the university, not just your college. Tutorials are at your home college.
On the subject of tutorials, a word of warning: King's students are worked HARD! In addition to attending lectures, I had to write a 1,500 to 2,000 word essay every week, read it out to my tutor and defend it against his (constructive) criticisms! One the other hand, there aren't many places outside Oxbridge where you still have one-to-one tutorials (I had some two-to-one tutorials in the first year, but in the second and third years they were all one-to-one).