Jon Bentley takes three battery-powered lawnmowers for a round of golf on a Ryder Cup course to find out which one is top of the leaderboard. Georgie Barrat heads to the States to take a ride in the world's most advanced autonomous car allowed on public roads. Meanwhile, Craig Charles is tasked with kitting out his smart home with a multi-room music system and Ortis Deley casts his eye back to 1977 to unveil the gadgets that helped pave the way for the subsequent tech revolution. Plus, Harry Wallop has more money-saving tips.