This year, a British rotor machine named Singlet (BID/60) was put on display at Bletchley Park in the superb Enigma and Friends exhibit put together by David White and John Alexander. There doesn't seem to have been much -- if anything -- written about this machine in the open literature.
The caption at Bletchley Park reads: "Singlet was used mainly by the British intelligence services C. 1949 / 50 onwards. This is a `Cold War' machine using wired rotors to achieve secure messages. We are very grateful to the Foreign and Commonwealth Office and GCHQ for this opportunity to show `Singlet' here at BP."
Singlet has windows and stepping levers for ten rotors. The rotor tube appears to be a detachable section, labelled BID/60/3, while the base unit is labelled BID/60/1. There is a hint of a connection to the KL-7 in this naming. According to George Mace on Jerry Proc's KL-7 page, the KL-7 components were originally labelled as follows: "the base unit was AFSAM 7/1 (aka KLB), rotor stepping unit AFSAM 7/2 (aka
KLA) and rotor basket AFSAM 7/3 (aka KLK)." The rotor tube, stepping levers and the keyboard are also all somewhat suggestive of some sort of link or common ancestry with the KL-7.
Some photos can be found on Wikipedia/Commons: 1, 2, 3, 4 and 5.