It`s an interesting question, although i`m sure it is HMS Herald.
She arrived in the Falklands on 26th May, joining her sisters HMS Hecla & Hydra & also SS Uganda. Her task was to transport casualties away from the warzone to Montivideo, Uraguay. She returned home leaving her sisters at the Falklands in company with HMS Hermes & entered Portsmouth on 21st July 1982, just ahead of HMS Hermes. These are official facts & I also remember the day well as an excited teenager.
There was a way of telling the difference between the Herald & Hecla, the Herald`s Red Cross on her sides were smaller than on Hecla. The top of the cross on Herald only went as high as her portholes, while on Hecla the cross was further up, inches away from her deck. The bottom of the cross was nearly at the water level on Hecla, while shorter on Herald.