John Cripps has unearthed this photograph of some fine upstanding (well, two are sitting) young HMSO Technical Staff in sporting mode.
Probably pre-activity given the lack of exhaustion on the faces of Messrs Marchant, Houston, Cripps, Holley and Justice.
No date given, but their combined ages as of 1 March 2020 would have been 379, so you can work it out from that. Or someone in Tech can.