Not sure if they would be willing to leave a well paid army career in britain to return to the low paid quagmire of fiji,even if they did, would britian be giving them the needed armour,artillary, and navy, air support, they dont have?i think not, especially if thier civilians are threatened, And hardly a giant, numbers wise only 2 active regiments in the main islands 2 others are scattered throught the islands,and counting that two thousand, similar size to our regular force plus territorial units,with none of the gear. But significantly less than NZDF, as a whole.
Not to take it OT, but realistically does NZ have the capability to conduct an amphibious opposed landing?
While Fiji might not have aircraft to use to provide air superiority or CAS, NZ does not really have such aircraft either. The P-3K2 Orions might be able to provide some ground attack and CAS using Maverick AGM's and/or Mk-82 'dumb' bombs, but without an ACF and AAR, NZ does not really have anything to bring to the fight in terms of combat aircraft.
As for artillery support, not sure what is really available to Fiji, but NZ would not really have much either, until a secure beachhead has been established. The two
ANZAC-class FFH's
might be able to provide NGFS, if they are available for deployment, and the Canterbury is felt to be safe enough so the FFH's are not needed for screening. Until the artillery can be landed and supplied with munitions, any NZ forces would not have artillery support either.
What this means IMO is that NZ could not successfully land and hold terrain in Fiji, because the fight would essentially be 'too even' meaning unacceptable (and unneeded) casualties. Keep in mind that with a very limited Kiwi ability to provide pre-landing bombardment, the 81mm mortars could make a right mess. If the
Fijian Dabur-class patrol boats are available/operational, they too could cripple if not sink the landing craft, unless either the FFH's are first tasked with neutralizing them, and/or the new Kiwi Seasprites with the Penguin AShM's can take them out. With the Canterbury having a similar armament (25mm gun on Canterbury vs. 20mm gun on the
Dabur-class) the MRV would not realistically be able to protect landing craft on their way from ship to shore and back. With only two LCM aboard Canterbury, plus the fact they are apparently in need of replacement... Things would not look good.
While the Canterbury does have spots for four helicopters, I do not think that they would be sufficient to bring in enough troops and more importantly heavy weapons and munitions, to overwhelm any defending Fijians.
Now if it was a joint ADF-NZDF amphibious operation, things would potentially be quite different due to both the quantity of assets, as well as some of the specific types available. Specifically the ability to track and sink any hostile vessels before they could get close to the landing ships, and the ability to have combat air support to target enemy points of resistance.