Falklands: No.10 record of conversation (2000Z) (MT-Whitelaw-Pym-Nott) ["it was decided that authority should be given to the SSNs to attack any Argentine naval warships which entered the Maritime Exclusion Zone"] [declassified 2012]

2000-2200Z. The full file from which this item is taken can be seen here.

There is a brief FCO record of the ROE decision which offers a little more detail, defining precisely the ROE and the restrictive amendments made to it. The FCO timed the decision as 2200Z (ie, 2300 BST), minutes before MT left for Chequers.