Calling at: Flitwick, 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, Haywards Heath, Brighton