Pye PTC1001 intercom

This is a mains wireless intercom probably from the late 1940s or early 1950s. Unfortunately, I don’t have any information of these units. I believe they were also known as the Pye Talkbox but I’m not sure whether that description applies to this particular model.

Manufactured ?
Valves UF41 UL41 UL41
Wireless Intercom
AC or DC Supply