The Marconi CR100 was one of the many radio communications receivers that appeared on the government surplus market in the 1950s and 1960s. The receiver was a single conversion superhet covering LF, MF, and HF bands that performed well for a radio of its time. The receivers were used by all three of the British Forces in World War II, providing a very effective communications receiver for a variety of purposes, even being widely used for the "Y" stations that intercepted Nazi radio messages for decryption by Bletchley Park. Many people will remember using one of these receivers, which for many short wave listenings and radio amateurs provided a good receiver at a moderate cost when they appeared n the government surplus market. Although, by today's standards, their performance is nothing special, for their day they proved their worth when they were most needed. Read more about the Marconi CR100: https://www.electronics-notes.com/articles/history/radio-receivers/cr100-marconi-radio-receiver.php
Dont forget that the National Radio HRO did the heavy lifting at Bletchley Park and other critical receiving sites after replacing UK built radios.
