The £2.5m house that's only fit for knocking down (to be replaced by a £4m one)

Just perfect, the estate agents say, for knocking down and starting all over again.

While many would be delighted just to get their hands on the five-bedroom Clouds Hill - with its marvellous sea views and own path to a Cornish beach - buyers with a couple of million or so in their back pocket are thought to have different ideas.

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To help them, the sellers have obtained planning permission to knock it down and the estate agents have come up with an artist's impression of the home that might replace it.

They said the new property, which would cost £600,000 to build, would see the home double in size from 2,500 sq ft to 5,000 sq ft and would be valued at more than £4million.

It would still have five bedrooms and an acre of grounds but the home would have a double garage, three bathrooms rather than the current one and an extensive conservatory.

Clouds Hill is on Trebetherick Point in Rock, North Cornwall, one of the most exclusive locations in Britain, and looks out over Daymer Bay and the Camel Estuary.

John Bray estate agents says there has been phenomenal interest from buyers across the world.

Spokesman Alex Roads said: "What you have to remember is this house was built in the 1950s, when having just one bathroom, despite the size of the property, was perfectly normal.

"It has stunning-wooden floors and beams but there is just one bathroom and virtually no parking at all.

"We tend to forget how our architecture and views on home design have changed over the years."

There are eight homes on Trebetherick Point - all built in the 1950s.

At one time they were all owned by the father of poet Sir John Betjeman, until he sold them off.

Clouds Hill is the first to be sold since then.

Rock remains a much sought after areas for people seeking holiday homes, despite the annual summer invasion of public school teenagers whose beach parties have become notorious.

Local property expert Giles Tanner said: "If whoever buys it decides to build the bigger house, it would probably be the best second home in Britain and worth at least £4million if not more."