On Call Welcome back to On Call, the weekly column where readers share their stories of tech support woes and triumphs.

This week we meet a reader we'll regomise as 'Nate' who told us a story from the 1990s, when he worked for Her Majesty's Government on the kind of agency papers that like to describe as 'secret'.

Nate could never figure out why, as the building where he worked was well signposted and even inhabited by some civilian businesses.

But the agency's operations included what Nate called "things we did behind closed doors that stayed that way."