Watford, Hemel Hempstead, Stevenage, St Albans, Welwyn Garden City, Cheshunt, Hoddesdon, Broxbourne, Hatfield, Borehamwood, Hitchin, Letchworth, Harpenden, Hertford, Bushey, Rickmansworth, Potters Bar, Berkhamsted, Abbots Langley, Ware, Royston, Broxbourne, Chorleywood, Croxley Green, South Oxhey, Tring, Baldock, Waltham Cross, Sawbridgeworth, London Colney, Radlett, Oaklands, How Wood, Redbourn, Bovingdon, Buntingford