Going to be controversial... but,
Silverstone
IMO It's dull and characterless, Its my least favourite of all the circuits I've been to in England (and Scotland), and I'm guessing it represents the UK on the F1 calender only because it is the only one long enough and wide enough, with sufficient run-off, and because it's the only one that can afford it... there is also the bitter pill of it being over-hyped and much loved by people who have never had the mis-fortune to be rinsed hundreds of pounds for the physical displeasure of having to watch a Grand Prix there. For me, the only thing going for it is the fact it's 20 miles away.... or 6 hours on race day.
Just my two cents, and I don't suppose there'll be too many other people that agree.