The wallpaper and curtains are very characteristic of their time; incidentally it's not the same room that Brooker, Wilson and Trower are pictured in.
The wireless, above, is tuned to the BBC's 'third programme' on the medium waveband, signifying that there's a lover of classical music in the house (or conceivably a cricket fan, in the summer months).
The over-large ring on Diz's middle finger can't have made it easy to play the bass … he's wearing it to play in the Selmer photograph, but not on the beach! It does appear on and off in other pictures too, and there are shots in which Gary wears a ring on the same finger too.
