This website details how Marc Gawley broke a Guinness World RecordTM - you can watch a video of the day here

It chronicles my attempt at the Tube Challenge - visiting every station on the London Underground network (270) in as short a time as possible. The challenge was first recognised in 1960, and according to Guinness the record had remained unbroken since 2009 at a time of 16hrs 44mins 16secs.

This is how I went about planning my assault on the record, a mixture of web research, on the ground reconnaissance, and some hefty analytics, in collaboration with Martin East.
I had an unexpected 15 minutes of fame, with radio, tvnewspaper stories, and an article in Mensa magazine.
Click a logo to see more:

More recently the BBC made some fun of me here.