This exact point does not appear to have been decided, but the answer seems obviouse that the covenants should cease to be enforceable. This is perhaps one of those situations identified by Steyn LJ in Continental Bank NA v Aeakos Compania Naviera SA, ‘the more obvious the answer to a question is, the less authority there sometimes is on it’. Let’s build up from first principles. What is a surrender? Between the tenant and his immediate landlord, where the tenant yields up the term to his immediate landlord, the lease is determined by surrender (Fairweather v St Marylebone Property Co Ltd). Lord Denning said surrender is not the assignment of the term by the tenant to the landlord, but their agreement to destroy the term, at paras