[holding answer 28 January 2008]: Transport Direct (www.transportdirect.info) the Department's multi-modal journey planner, provides average CO2 emissions per person for journeys within Great Britain. The planner gives the following estimates of kg CO2 per passenger:
London to: Bristol Birmingham Newcastle Edinburgh km 182 170 408 578 Air 128.7 126.9 64.5 91.3 Rail 10.9 10.3 24.6 34.8 Small car2 23.2 21.7 52.1 73.7 Large car2 46.7 43.8 105.1 148.7 1 Journey by this mode is not possible but is calculated on average emissions for the relevant distance. 2 Assuming one occupant.
These figures do not include lorry travel as the Department does not collect figures on passengers travelling by this mode. However, the Department for Environment, Food and Rural Affairs Company Reporting Guidelines (http://www.defra.gov.uk/environment/business/envrp/pdf/envrpgas-annexes.pdf) give average emission factors per km for lorry journeys, separated by type of vehicle and laden factor (the extent to which the lorry is loaded to its maximum carrying capacity).
For example, the average CO2 emissions from a 0 per cent. laden rigid HGV (carrying no load), travelling from London to Edinburgh, is approximately 359 kg. With a laden factor of 100 per cent., this average increases to about 517 kg. Actual emissions will vary depending on, for example, the particular vehicle, driving style and laden factor. Similar calculations can be made using the guidelines for journeys between any two points in the UK.