Purley, South Croydon, East Croydon, Norwood Junction, London Bridge, London Blackfriars, City Thameslink, Farringdon, London St Pancras (Intl), St Albans, Harpenden, Luton Airport Parkway, Luton, Leagrave, Harlington, Flitwick, Bedford
Merstham, Coulsdon South, East Croydon, London Bridge, London Blackfriars, City Thameslink, Farringdon, London St Pancras (Intl), Finsbury Park, Stevenage, Hitchin, Arlesey, Biggleswade, Sandy, St Neots, Huntingdon, Peterborough