When the alarm rang at 4.45am this morning, I was already awake. Nobody overslept or moaned about feeling tired. And after a quick pre-action breakfast we piled into the minibus, loaded with climbing equipment, a huge banner and our petition printed with the names of 20,000 UK campaign supporters. We were on route to Lewes, the constituency of UK Transport Minister, Norman Baker, who this Wednesday will represent the UK in a make-or-break moment for the future of pollution from cars.