As with other ITC series, the American market was vital; several episodes were overdubbed (e.g. "petrol" becoming "gas", "whisky" becoming "Scotch") to ensure they were fit for US audiences. Roy Ward Baker stated that owing to US sponsorship by a cigarette company, characters "were allowed to light up only in moments of leisure, never when they were frightened or under duress". The show did not do well enough on ABC and was syndicated midway through its run, which effectively ensured that no second series would be made.