Sussexborn Quote [To outsiders it is sung by the Communist party so not really the brightest of moves. ] End Quote.
I believe it is the "international" that is sung by communist movements worldwide. In that, the Red Flag is unique in being the anthem of the British labour movement. However, I stand to be corrected if any forum member possesses alternative knowledge.
In regard to "outsiders" viewing the singing of the Red Flag as a communist cymbal, that may well be the case, but that anthem has always been at the very base of the British Labour movement and in singing it I feel that the members see it as part of their deep heritage with little interest in what anyone outside that culture may think.
In the above, I feel what was witnessed in the House of Commons last night was a spontaneous act aimed at the very "downtrodden looking" Tory MPs as they left the chamber.
It was a very appropriate act I feel in view of the circumstances that all the MPs were leaving the chamber under.