text: The St Albans Bypass bit definitely comes originally from the statutory instruments when the road was created.  The London Orbital name is (a) on approach signs (e.g. London Orbital M25 x miles), and (b) on documentation, see for example http://discovery.nationalarchives.gov.uk/details/r/C11292342
  
  The names J21 M J L etc. should be carriageway_ref and not names.