Money Saving Expert Martin Lewis has built up a property empire said to be worth £12.5 million thanks to his savvy fiscal tips.The 48 year old and his wife Lara, 41, have invested millions of pounds buying real estate in affluent north England towns like Wilmslow and Knutsford in Cheshire. Martin, who is a regular guest on This Morning alongside Phillip Schofield and Holly Willoughby has given nearly £20million of his own fortune to charity over the last eight years.