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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Yousaf Khan and Xavier Christopher took their young victim to a secluded alleyway in Northholt where they also urinated on him.
After a wet and windy start to the week, conditions will gradually improve, with temperatures creeping up, and up.
Sir Bernard Hogan-Howe made the comments as an independent review into the way rape allegations are investigated.