British conventional-submarine design work alongside SSNs

Could British shipbuilders contribute conventional-submarine designs for Australia or Canada?

Possibly, depending on their requirements; the argument is that British SSK design work accompanies nuclear-submarine development and may remain current.

British designers are said to examine conventional-submarine concepts while working on nuclear attack submarines. The two batches of Astute-class boats are described as substantially different, suggesting that associated design work has continued. Relevant SSK knowledge may therefore exist alongside the later Astute work. Australian and Canadian requirements would determine whether it could support an allied program; no committed British conventional-submarine class is identified.