Why Upholder exports were mostly implausible

Could Britain sell Upholder-class submarines to India, Canada, New Zealand, and Ireland?

Canada was the plausible exception. India, New Zealand, and especially Ireland were unlikely customers.

The proposal spreads Upholder-class boats across four potential export customers. India, New Zealand, and especially Ireland are treated as unlikely buyers. Canada is the exception because it did acquire the class, although the judgment here is that a lack of alternatives drove that purchase. Export prospects depended on buyer policy and the available competition as much as on the submarine itself.