If you want to stick with canon (geographical errors notwithstanding) you could say that at least two of the helos were from a ship that suffered damage; perhaps the helos were airborne on ASW work and the helideck/hangar was hit? Admittedly, that creates the questions of whose submarine and who won, but it is a logical reason for those Lynxes being there.
One of the things I like about this website is the fact that I can use words like "notwithstanding"...
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