the Cambridge Ring / was Re: Token Ring Hub

All this talk of token rings has reminded me of the original Cambridge ring. In the early 80's a project in the CS department where I was working was going to set up a Cambridge ring. A bunch of hardware was ordered and received from England: as I recall the network nodes were a yellow metal box around 12"*16"*4" with a hinged door and PCB, etc. inside. At the same time, Ethernet (thickwire, of course) was becoming current and wire was pulled through the CS building to accommodate both Ethernet and Cambridge ring (I think the decision-makers were hedging bets as to which technology was going to predominate). The Cambridge ring nodes sat on a shelf for years and were never used, while various machines (primarily a VAX780 and 750) went on the ethernet. I think a lot of the issue was availability of processor interface hardware/drivers. Anybody recall or have some of these nodes? Is there a Cambridge ring running anywhere? (Bletchley perhaps.)