Of course these are thanks to the wonderful London Transport Museum collections!
Manor House Underground Station, 1932. Source
The posters, left to right, are these by Louis Whirter, also from 1932:
A themed set outside St. James's Park station, 1931: Source
The posters are this wonderful series by Andre Edouard Marty, 1931:
A zoomed out view of St. James Park Station. You can see the four posters to the left of the doors. Source