Fight to own Britain's biggest mega-mansion: An oligarch whose daughter-in-law is 'too pretty to work' is trying to see off an ex-colleague who says a verbal agreement entitles him to £300m pad in London. DOMINIC MIDGLEY explains the very ugly court battle

When Britain's biggest private house, a mega-mansion called Witanhurst on Highgate Hill in north London , went on the market in 2008, it was close to a ruin.

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