A Knightsbridge house could be tripled in size by drilling that goes 50 feet underground.
But the neighbours of the homeowner who wants to do this has aren't too happy, as Marcus Powell reports.
More top news
Donald Trump is to visit the UK on July 13 and hold bilateral talks with Theresa May, Britain's ambassador to the US has said.
The Football Association has announced it has received an offer to buy Wembley Stadium.
The most hotly-tipped date is July 13, following the Nato summit which the president is due to attend in Brussels on the previous days.