There's a scene in this episode where the main character asks to be taken to Manchester Square. The building that he is taken to is EMI House and the stairwell above the door is where the famous picture of The Beatles on the front cover of Please Please Me was taken. The building has since been demolished.
The copy of The Times with the headline "Rare painting by La Tour to be auctioned" that Brad reads is from 11th October 1972.