Despite The Berkeley being more than 125 years old, Harriet Brewis discovers what futuristic features the hotel is hiding behind its historic walls, from high-tech toilets to a state-of-the-art gym Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Steeped in history with