HC Deb 25 October 1962 vol 664 c226W
Mr. Russell

asked the Postmaster-General how the revenue obtained from telephone subscribers on exchanges now operated under the Subscriber Trunk Dialling system compares with that obtained before the system was installed.

Mr. Bevins

The immediate effect of introducing Subscriber Trunk Dialling has been to reduce the revenue obtained from the subscribers concerned by about 7 per cent.