HMNZS Waikato (F55) was a Leander Batch 2TA frigate of the Royal New Zealand Navy (RNZN). She was one of two Leanders built for the RNZN, the other being the Batch 3 HMNZS Canterbury.

 

These two New Zealand ships relieved British ships of the Armilla patrol during the Falklands conflict, freeing British ships for deployment.

https://en.wikipedia.org/wiki/HMNZS_Waikato_(F55)