Thanks guys. I too scoured the interweb as well as did the google and duckgo image matching things but came up with naught.

Maybe it is a Facebook/Twitter developed headphone to monitor what subversive podcasts I dare to listen to?

Well anyway the next chapter in this thrilling instalment will be the arrival of new cables so I can actually listen to the headphones. The current cable seems broken - there is no continuity on the ground. Needs a special cable (3.5mm stereo to two 3.5mm monos). Lawrence kindly found me a suitable cable the other day.