Watford, Hemel Hempstead, Stevenage, St Albans, Welwyn Garden City, Cheshunt, Bishop’s Stortford, Hatfield, Borehamwood, Hitchin , Letchworth, Harpenden, Hertford, Bushey, Rickmansworth, Berkhamsted, Abbots Langley, Ware, Royston, Chorleywood, Croxley Green, South Oxhey, Tring, Baldock