The Sir Percivale was a companion ship to the Sir Galahad, synonymous with the Falklands conflict.
An unidentified ALP and pump can be seen in this picture.

L to R Y246XRN [30] DK05HBD [15] PN04KTF [40] DK05HBE [18]

L to R unidentified, DK05HBO [25] DK59BPE [13] DG02WFZ [10] DG02WFW [14] Y242XRN [31]