London Hydrogen Network Expansion.

Lasting 6,096 miles over six days was the trip the London Hydrogen Network Expansion (LHNE) says is the longest tour made on hydrogen in the UK ever. At the same time, the project claims it set another new record as it went 400 miles (645 km) on one H2 charge in a Hyundai ix35 Fuel Cell.
fleetnews.co.uk, greencarcongress.com