It's all here...
...the Wolseley with the bell, Lockhart (it's a filmed sequence, so no fluffing lines), Eric Lander and the theme tune.
Johnny Briggs later replaced Eric Lander (I once saw Eric Lander live at the St George's Shakespeare Theatre, Tufnell Park).
The person who uploaded the episode to youtube calls it "50s drama", but the episode concerned is definitely from no earlier than 1964, which was the year that the company changed its name from "Associated-Rediffusion" to "Rediffusion London" and dropped the full-screen revolving star ("adastral") logo in favour of the muted contrasting grey stripes.
The theme tune was also recorded in stereo for commercial release - the middle bit sounds like Elgar. I have a copy somewhere...


