House prices at the top end of the market are expected to soar by 19.3 per cent in Bucks over the next five years according to research by Savills published this week.

Next year alone the value of country houses in the south east is tipped to rise by four per cent suggesting that today’s £2.5m guide price for a Grade II* listed landmark home in Old Amersham could be a snip by 2025.

High & Over is regarded by architects as one of the most important buildings built in England in the 20th century.

It was the first house designed in the distinctive Modernist style by the eminent architect Amyas Connell.

One of his clients in 1929 was Bernard Ashmore, Professor of Archaeology at London University.

The academic and his wife were pleased about his new job but didn’t want to live in London. They loved the great outdoors. Amersham with its railway line into the metropolis fitted the bill perfectly.

Not everyone was impressed by the house designed for them in the sticks by the young architect whose work had been influenced by the great Le Corbusier at the Paris Exhibition in 1926.

Not surprisingly there have been several changes to the style of the living area over the years. In 1962 the house was divided into two by the then incumbents. It remained a pair until 2008 when it was made whole again.

Today the layout and the decor is as the original owners intended with the bonus of mod cons and 21st century innovations.

The internal living area is 4,500 sq ft. Most of it has recently been restored. The rooms are arranged in three wings off the hexagonal hall with a circular gallery above.

The interior style is iconic, Due to the shape, the white-rendered property has always been known locally as the Aeroplane House.

Having embarked on a full scale, sympathetic restoration, the present owners have piloted it back to a level that merits its elite Grade II* listing.

The grounds amount to almost one-and-three-quarter acres. The circular swimming pool is a winner as is the overall landscaping.

Many of the original features at High & Over have been re-instated inside and out. There are three principal reception rooms including a library; the kitchen is custom built; there are two staircases (sweeping main flight and the back stairs); there are five if not six or seven bedrooms spread over the two upper floors depending on how you choose to use the rooms. Plenty of scope here for working from home.

In this aeroplane no-one travels cattle class, it’s first class all the way.

Agents: Savills’ Amersham office and The Modern House in London.