J.Lauritzen's 1956 Rendsburg built ANITA DAN is seen passing Portishead, outbound from Avonmouth for Liverpool, on a voyage from Montreal which seems to have been her last commercial voyage.

https://en.wikipedia.org/wiki/HMS_Endurance_(1967) says:
The UK government bought her in 1967 and had Harland & Wolff convert her. She was commissioned into the Royal Navy as HMS Endurance, named after the sailing ship Endurance that took the explorer Ernest Shackleton's expedition to the Antarctic in 1914.

The new Endurance maintained a UK presence in Antarctica and the Falkland Islands during the southern summer. She also supported the British Antarctic Survey. She had a bright red hull, as is common for polar vessels to aid visibility but otherwise uncommon for the Royal Navy, so her crew nicknamed her The Red Plum. In February 1972 when the cruise ship Lindblad Explorer ran aground, Endurance was in the vicinity under Captain Rodney Bowden and took part in the rescue.

The Ministry of Defence's 1981 Defence White Paper proposed naval cuts including decommissioning Endurance, which was scheduled for 15 April 1982. However, on 19 March 1982, while Endurance was at Stanley, South Georgia was occupied by Argentine civilians. The ship, commanded by Captain Nick Barker, was sent to order the Argentines off the island. Endurance had a small Royal Marines detachment and took further Marines from NP (Naval Party) 8901, and sailed on 21 March for South Georgia.

In 1989 she struck an iceberg and although she was repaired, a survey in 1991 found that her hull was not sound enough for a return to Antarctica and she was finally decommissioned.

On 20.11.91 she suffered damage and was sold for breaking at Karachi where she finally arrived on 11.1.93.