Near the beginning of this episode one of the main characters arrives at Midwich railway station.
Based on the destination and calling pattern (Great Missenden, Amersham, Chalfont & Latimer, Chorleywood, Rickmansworth, Harrow-on-the-Hill, London Marylebone) of the train that's due, it seems that "Midwich" station is actually Wendover, on the Aylesbury Vale Parkway to London Marylebone line which, at the time of release, is served by Chiltern Railways.