Service area
St Albans, Harpenden, Hatfield, Welwyn Garden City, Radlett, London Colney, Wheathampstead, Sandridge, Watford, Hemel Hempstead, Berkhamsted, Tring, Kings Langley, Abbots Langley, Rickmansworth, Chorleywood, Bushey, Stevenage, Hitchin, Letchworth Garden City, Baldock, Royston, Hertford, Ware, Hoddesdon, Broxbourne, Cheshunt, Waltham Cross, Bishop's Stortford, Sawbridgeworth, Buntingford, Potters Bar, Borehamwood, Elstree, Shenley, Cuffley, Barnet, Finchley, Whetstone, Muswell Hill, Highgate, Hampstead, Golders Green, Hendon, Edgware, Mill Hill, Southgate, Enfield, Palmers Green, Winchmore Hill, Tottenham, Wood Green, Haringey, Camden, Islington, Holloway, Archway and surrounding areas.