Holiday House London is two ginormous Maida Vale mansions, right next door to each other, which have been completely transformed inside, top-to-toe, by some of the worlds leading interior designers. The mansions act as showhouses for the elite designers, plus some of the best lifestyle brands, to showcase their product and talent.  The houses are then opened up to the public, and all money raised goes towards the prevention and cure of breast cancer. You'll agree that this is an excellent idea and a very worthy cause, but I am going to be completely honest here - I had heard of Holiday House London, but it wasn't something that I thought I would be interested in. I totally wrote it off as a big rich fundraiser for big rich people to showcase the sort of interiors and design that decked out a Kensington pied-à-terre, or a home in upstate New York.