Where are Britain's most expensive houses? And why?

John Phillips/UK Press/Press Association Images

Britain's most expensive neighbourhood boasts average property prices of almost £1.9 million - an increase of 5% since this time last year. It is also home to the UK's most expensive street, where the average property is worth more than £22 million.

So where are properties fetching these extraordinary prices, why are they so valuable, and what is set to happen to prices here next year?