North London: (n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14, n15, n16, n17, n18, n19, n20, n21, n22)

Kentish Town, Archway, Highbury, Enfield, Epping Forest, Barnet, Barnsbury, Canonbury, Lower Edmonton, Crouch End, Fortis Green, East Barnet, Seven Sisters, Southgate, East Finchley, New Southgate, Hendon, Finchley Central, Finsbury Park, Finsbury, Holloway, Hornsey, Upper Edmonton, Islington, Manor House, Muswell Hill, Pinner, Stoke Newington, New Barnet, Tottenham, Woodford Green, Tufnell Park, North Finchley, Palmers Green, Friern Barnet, Hampstead Garden Suburb, Highgate, Woodside Park, Pinner Green, Cockfosters, Ponders End, Enfield Park, Potters Bar, Alexandra Palace, Totteridge, Winchmore Hill, Whetstone.

Hertfordshire:

Amersham, Aylesbury, Barnet, Bedford, Brentwood, Cambridge, Chelmsford, Chesham, Dunstable, Edgware, Enfield, Harlow, Harrow, High Wycombe, Leighton Buzzard, London (central), Luton, Northwood, Pinner, Waltham Abbey, Baldock, Berkhamsted, Bishop’s Stortford, Borehamwood, Broxbourne, Bushey, Cheshunt, Chorleywood, Croxley Green, Elstree, Harpenden, Hatfield, Hemel Hempstead, Hertford, Hitchin, Hoddesdon, Letchworth, Potters Bar, Radlett Rickmansworth, Royston, Sawbridgeworth, South Oxhey, St Albans, Stevenage, Tring, Waltham Cross, Ware, Watford, Welwyn Garden City.