It is thought there will also be a large wine cellar, an art storage room, gym facilities and male and female changing rooms at the house owned by David Graham, a Canadian who according to reports made hundreds of millions of pounds when he sold his cable television business.
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Londoners who have received new electronic gadgets for Christmas are being advised to take simple steps to protect them from thieves.
The Boxing Day sales got off to a flying start with shops reporting a surge in business during the first hour of trading.
Bus strikes are planned for Monday 29 December and Monday 5 January.