Though it’s considered to be a Canadian classic, it’s somehow taken nearly 40 years for David French’s Salt-Water Moon to reach the UK, directed by Peter Kavanagh at the Finborough. Part of the semi-autobiographical “Mercer series”, this gentle two-hander introduces us to Jacob (Joseph Potter), newly returned to his Newfoundland home after a year in Toronto, and Mary (Bryony Miller), the sweetheart he’s come to win back.