Annual figures for the number of foreign registered HGVs travelling from GB to mainland Europe are published in section 3, table 3.3 of “Road Freight Statistics: 2005”.
This is available on the Department for Transport’s website at http://www.dft.gov.uk/stellent/groups/dft_ transstats/documents/page/dft_transstats_611935.hcsp and is also available in hard copy from the Library of the House.