While Lord Wellesbourne is a stand-alone book, it does share connections with The Return.
Boxing: Like Lord John Latham, protagonist of The Return, Wellesbourne is a boxing enthusiast, though not at a professional level. And, like Latham, Wellesbourne boxes at Jackson's boxing salon.
The Law: Herbert Ward acts as the family solicitor to both the Latham family and the Sinclair family.
Eton College: Both Latham and Wellesbourne attend Eton College at the same time, though Latham is two forms ahead as he's two years older. Wellesbourne witnesses Latham's dramatic tower-top recitation of the St Crispin's Day speech from Henry V.