The wedding on the beach takes place to the strains of "Sull'aria...che soave zeffiretto" from Mozart's "The Marriage of Figaro", a beautiful duettino familiar to many from its use in "The Shawshank Redemption". Ironically here, as in "Shawshank", it is a song about exposing marital infidelity.
Frances Barber (Brides Mother) was in an episode of Red Dwarf (1988) with Danny John-Jules (Dwayne). She played Genny the genetic mutant in Polymorph (1989) that the Cat meets whilst trying to find the escaped polymorph.
Robert Pugh (Mike Watson) & Frances Barber (Diana Watson) also worked together on episode 1.4, A Murder Is Announced (2005), of Marple (2004) as Colonel Easterbrook & Lizzie Hinchcliffe respectively,