Britain’s poshest streets have been revealed – and one of them is in Hertfordshire.

Robins Nest Hill, which runs north towards Hertford from the idyllic village of Little Berkhamsted, is listed third in the countdown of Britain’s most expensive streets outside London.

According to Zoopla’s Rich List 2018, homes here have an average value of £3,782,579, placing it in third place behind Montrose Gardens in Leatherhead, Surrey (£5,923,253), and Phillippines Shaw in Sevenoaks, Kent (£4,112,413).

To achieve these eye-watering results, Zoopla analysed data from the 20 largest counties outside the capital according to population size.

Harpenden also got a mention on a separate list of areas outside London with the most streets containing homes worth an average of £1 million or more. The town came in 10th place with 145 streets, while Reading topped the list with 242.

The number of million pound addresses is increasing rapidly: there are now 17,289 streets in Britain where the average property value is £1 million-plus, up from 14,417 in 2017.

Not surprisingly, the vast majority (91.2 per cent) of streets with an average property price of £1 million and above are found in southern England.

Lawrence Hall, spokesperson for Zoopla, said: “Despite London’s property market continuing to plateau, its sheer desirability means that its most exclusive boroughs continue to dominate the list.

“While the capital may be home to the most expensive streets, it’s the South East region that takes the top spot for the highest volume of streets with an average value of £1million or more, perhaps due to the rising cost of London’s commuter-belt areas.”

The most expensive street of all remains Kensington Palace Gardens, home to Formula One heiress Tamara Ecclestone, and Chelsea FC owner Roman Abramovich. The average home here costs a hefty £35,647,605 – down £1,301,983 on last year.