What Britain might offer for Canadian nuclear power in 1920

What might Britain give Canada for reliable nuclear-power technology developed secretly in 1920?

Very generous terms are envisaged because the technology could transform electricity supply across Britain and the Empire.

Reliable nuclear power in 1920 would give Canada something Britain would strongly want to acquire. A programme begun during the 1920s is imagined producing a British grid much less dependent on coal, oil or hydropower by the following decade. Canadian industry could also benefit where inadequate infrastructure constrained production. Australia is raised as another place where additional power would be useful. The possibility of selling access to the United States then extends the question from domestic electricity supply to international bargaining.