There are currently 21 properties for sale in the UK for at least £20m and almost a quarter (five) of these are flats, according to HouseSimple.com.

The online estate agent researched the super prime property market and found that the exclusive £20m Plus Club includes properties ranging from a country house in Ascot, in 70 acres of land, to a four-bed flat in Knightsbridge, Central London. Only one property at £20m or above is located outside the capital.

The most expensive property on the UK market at the moment is a six-bed terraced house in Belgravia, with an asking price of £62,500,000. A buyer would have to pay Stamp Duty of almost £7.5m on this property alone. That’s the equivalent of the total Stamp Duty bill on 4,038 properties being marketed at £217,888, the average UK house price.

Alex Gosling, CEO of HouseSimple.com, said: “The super prime market has suffered since the Stamp Duty changes, but that doesn’t mean it’s dead in the water. When you have £20m plus to spend, you’re unlikely to baulk at paying a few million pounds in Stamp Duty. And there are buyers out there still willing to pay premium prices to live in the most exclusive areas.

“So what does £20m get you? Outside London you can probably pick up a country estate. In London, with the price per square footage so high in areas like Knightsbridge and Belgravia, you might have to lower your expectations. It’s staggering that a quarter of the most expensive properties on the UK market right now are flats. It just shows how crazy the property market is in the capital when £20m doesn’t even buy you a house!”

At £10m and over, there are 107 properties currently for sale in the UK with a combined value of almost £1.7bn. Four out of 10 (40%) of these properties are located in Belgravia, Knightsbridge and Mayfair, in Central London.