Orlin Roussev, Biser Dzhambazov and Katrin Ivanova, who were among a total of six spies found guilty of spying for Vladimir Putin, can be seen at an event in May 2016.
Kneecap provoked condemnation in Parliament over footage of their gigs now probed by police - plus calls for them to be axed from this year's Glastonbury Festival .
QUENTIN LETTS: But the drone factory at Westminster was still producing annoying devices - known by various names, most politely 'MPs' or 'backbenchers'.