Those parts of Surrey, Hampshire, Wiltshire, Berkshire, Oxfordshire, Buckinghamshire and Greater London.
Bounded by: On the North by A4260, B4100, B4031, B4100 from Banbury to Bicester, A41 through Aylesbury, bypassing Tring, Hemel Hempstead and Watford to the Thames at Westminster Bridge. On the East the A3 to Wimbledon Common, A308 to Kingston-on-Thames, A307 (via Esher) to the crossing point with the A3 north of Cobham. A3 to B2215, through Ripley to rejoin A3. A3 to A272 junction at Petersfield. On the South A272 from Petersfield to New Cheriton, B3046, B3047 to Abbots Worthy, A33 TO JUNCTION WITH A303 SOUTH OF NORTH WALTHAM. A303, A34 to Whitchurch, B3400, A3093, A342, A346 to Collingbourne Ducis. On the West by A388, A346 via Marlborough to M4 (junction15) at Swindon, A419, A420 to Faringdon, A4095, B4020, B4474, B4020, A40 to Burford and A361 to Banbury.