BPO EXCHANGES OPENED 1914-1924
| Date | Name | System |
| 1914 | Hereford | Lorimer |
| 1914 | Darlington | Western Electric (Rotary) |
| 1915 | Accrington | ATM (step by step) |
| 1915 | Newport (Mon.) | ATM (step by step) |
| 1915 | Cheptsow | ATM (step by step) |
| 1916 | Portsmouth | ATM (step by step) |
| 1916 | Paisley | ATM (step by step) |
| 1916 | Dudley | Western Electric (Rotary) |
| 1916 | Blackburn | ATM (step by step) |
| 1918 | Leeds | ATM (step by step) |
| 1918 | Grimsby | Siemens Brothers (step by step) |
| 1919 | Stockport | Siemens Brothers (step by step) |
| 1921 | Ramsey | Siemens Brothers (village) |
| 1921 | Hurley | Siemens Brothers (village) |
| 1922 | Fleetwood | Relay Automatic Co. |
| 1923 | Southampton | Siemens Brothers (step by step) |
| 1924 | Swansea | Siemens Brothers (step by step) |
| 1924 | Sketty | Siemens Brothers (step by step) |
| 1924 | Dundee | Peel Conner/North Electric (step by step) |
| 1924 | Broughty Ferry | Peel Conner/North Electric (step by step) |
| 1924 | Marton | ATM (village) |
| 1924 | York | ATM (step by step) |
| 1924 | Hadleigh | PO (Rural Automatic System) |
| 1924 | Blockley | PO (Rural Automatic System) |