Attached are the best photos I could find showing Island Class rear ends 😮🙈
The pic of BNS Sangu you may recognise, formerly HMS Guernsey P297.
As usual most photos are of a few points off the bow, probably thought to be more dramatic / dynamic.
These mysterious racks look like 3x2 chutes for dropping something, I know not what, into the drink. Hedgehog bombs maybe?
Fuel can racks sounds plausible, but why then would you need the big 'oles in the bulwark for that? And would you really want racks of high octane fuel standing about on the quarter deck?🔥
Also puzzling is why 2 stbd side, only 1 portside and 1 in the transom?
Just build them as 3x2 wine racks and fill 'em with champers bottles. 😉
Curiously; while sniffing around I ran across a Deans Marine 1/96 Island class kit advertised as HMS Guernsey. On opening the description the photo showed HMS Orkney, P299, with correct name and pennant number!
If you download the photos and view in a half decent image viewer (I use Irfanview) you can see the much larger images as in the originals.