Imagine being able to pick a different classic car to drive every day of the week – this might be the stuff of dreams for most of us, but for a lucky few it’s a reality. There are some incredible car collections held by private owners across the world, often worth millions (or in some cases billions) of pounds. Here’s our run down of five of the most famous… The Sultan of Brunei The Sultan of Brunei’s car collection, perhaps unsurprisingly for one of the world’s richest men, includes some of the rarest and most valuable motors in the world. The collection numbers well over 5,000 cars, so he doesn’t just have a different car for every day of the week, but one for every day of the year for over 13 years. The collection includes 531 Mercedes-Benzes, 185 BMWs, 177 Jaguars, 20 Lamborghinis and 367 Ferraris. But perhaps the highlight is a custom-made Rolls-Royce Silver Spur Limousine embellished with 24 carat gold. At least this is distinctive enough to mark it out from the other 129 Rolls-Royces in his collection. So where does he keep all these amazing motors? The cars are housed in five garages, each the size of an aeroplane hangar. With a net worth of nearly $20 billion, and who would bet against a sixth garage being constructed before too long. Jay Leno Stand-up comedian, actor and television host Jay Leno might not have as big a car collection as the Sultan of Brunei, but at least every car he owns is actually driven and enjoyed by him rather than sitting in a garage. Leno’s collection of more than 200 cars and bikes includes 17 classic cars, including a 1956 Austin-Healey 100 BN2, a 1966 Chevrolet Corvair Corsa and a 1955 Mercedes-Benz 300SL Gullwing Coupe. He also has 60 ‘super cars’ including a 2012 Lamborghini Aventador LP700-4 and a McLaren MP4-12C. Fellow car enthusiasts can view the whole collection on his website, Jay Leno’s Garage, which includes clips and details of all his cars. Ralph Lauren He may be a famous clothes designer, but Ralph Lauren is also renowned for his impressive car collection. It includes the world’s most expensive car, a 1938 Bugatti 57SC Atlantic. An edition of the same car sold in 2010 for between a staggering $30 million and $40 million, and Lauren’s car could be worth even more after it scooped the top prize earlier this year at the exclusive Concorso d’Eleganzo car show in Italy. Lauren also owns plenty of other valuable classic cars, including a 1958 Ferrari Testa Rossa which is surrounded in his garage by other Ferraris from the 60s, 70s and 90s. His latest indulgence is a new $769,000 silver RUF CTR-3 Clubsport , often described as a Porsche 911 ‘on steroids’. Jay Kay The front man for band Jamiroquai, and perhaps best known for his penchant for unusual headwear, Jay Kay’s other love is fast cars. While his collection doesn’t rival some of those featured here, he still owns more than 50 vehicles, including a Ferrari Vignale 330GT, a Porsche 911 2.7 RS and a Mercedes Benz 300SL Roadster which came from Portugal. He also has an Aston Martin DB6 Mark 1 Volante, of which only 185 were ever made. However, speed demon Kay admits he has to restrain himself when it comes to putting his foot down, especially since he was caught driving at 111mph back in 1998. Nick Mason Nick Mason is the second musician to make it onto our list. The drummer for Pink Floyd, Mason collects vintage racing cars, and, having sold over 250 million albums over the years, has pockets that are more than deep enough to indulge his passion. His collection of around 50 cars is housed in a hangar in the Cotswolds, and includes a 1927 Type 35 Bugatti, a McLaren F1 GTR and a 1931 Alpha Romeo 8C 2300. But perhaps the jewel in his collection is a 1967 Ferrari 250 which he bought for £37,000 for in 1997. It hasn’t proved a bad investment - one sold in 2012 for more than £20 million, and DJ Chris Evans paid £12 million for his in 2010.