Does Geoff have an unhealthy obsession with the London Tube? He likes to think so, but please don't call him a train spotter. Instead, revel in the story of this metrosexual's passion with the Tube and how over 12 years of Tube challenging has led him to struggle to understand why he does this and accept his accolade of being Guinness World Record holder for travelling in the fastest time around the whole of the Underground.