This just on twitter from the UK Ministry of Defence about the recent magnificent voyage of HMS Protector.
On the web page in the link it says
By visiting this region Protector achieved a latitude of 77 Degrees 56 Minutes South – the very edge of the vast Ross Ice Shelf, named for James Clark Ross who led the exploration of the area.
No official British ship has been this far south since 1936 and it is believed not since James Clark Ross’s own expedition in 1842.
I don't think this is true. The British Antarctic Survey Ship RRS Bransfield reached likely a little further south. According to this note from the Second Officer Chris Elliot which is published on the website The LOFTSMAN which is about the shipyards of Leith.
RRS Bransfield reached 77°56' 44"S.
So 44 seconds further south than HMS Protector.
Which is what? 1.3 km?
I know it's not much further south and Protector likely matched it (they don't give their decimal). I just wanted to make the point that it is close. Very close.
The second officer in the note - Chris Elliot went on to become the Captain of the RRS John Biscoe, and then he was a member of the team that built the RRS James Clark Ross for many years, before becoming one of the Captains of that great ship.
UPDATE See comment below by Radio Officer of the RRS James Clark Ross Mike Gloistein.