Harlington, Leagrave, Luton, Luton Airport Parkway, Harpenden, St Albans, Brent Cross West, West Hampstead Thameslink, London St Pancras (Intl), London Blackfriars, East Croydon, Purley, Redhill, Horley, Gatwick Airport, Three Bridges, Haywards Heath, Brighton
Harlington, Leagrave, Luton, Luton Airport Parkway, Harpenden, St Albans, Radlett, Elstree & Borehamwood, Mill Hill Broadway, Hendon, Brent Cross West, Cricklewood, West Hampstead Thameslink, Kentish Town, London St Pancras (Intl), London Blackfriars, East Croydon, Purley, Horley, Gatwick Airport, Three Bridges