Doctor in the House S09E09 - Alias Clarke and Waring

Professor Beaumont receives a letter from Sir Geoffrey claiming that Duncan owes two thousand pounds in gambling debts back in Britain. In fact the culprit is Dick, who has used Duncan's name and Duncan threatens to have him extradited unless he clears the matter up. Dick goes to the bank to collect the money but blows it at the races, earning a thump from Duncan. Beaumont agrees to take the money out of Dick's salary but Dick finds out that he is not the only one to use another's name in vain.