• All the table and floor mounted wooden switchboards used, for example, in small businesses, factories and hotels. Most of these are connected to a range of suitably dated wall and table telephones on the displays.
  
  
• Two of the operator switchboards of the early Central Battery Signalling (CBS type 2) from the Scottish west coast town of Malliag. This had lines to Fort William, Oban and some of the remote offshore islands.
  
  
• A Private Manual Branch Exchange (PMBX 4), one of the last of its type.
  
  
• One of the 80 operators positions from Shoreditch ( London) This is a sleeve control board and is used to show both an operator call and an emergency 999 call which the visitors can connect to a make believe Fire Station Red Telephone.
  
  
• Other types are in store awaiting space and time to restore. One of these is a Central Battery (CB9) from RAF Gloucester dating back to the 1930's.
  
  

P.M.B.X. 5+20