Former Royal Marines Commando and adventurer Dave Thomas from Seven Sisters in South Wales has just celebrated his 68th birthday in the coolest possible way. Dave is aiming to set a new Guinness World Record, becoming the oldest person to ski unsupported from Hercules Inlet to the Geographic South Pole as part of Mission Spiritus Antarctica. This is a multi-purpose scientific polar expedition featuring a gruelling sled-haul of 1,150-km with fellow Bootneck, Alan Chambers MBE with whom he has been buddies…