The University of Stirling in Scotland is the venue for another heat of Mastermind, a competition requiring both specialist and general knowledge, and, as time is of the essence, a razor-sharp mind. A further four contestants take up the challenge for the title of ' Mastermind of the United Kingdom.' They are: DR G. MICKENZIE , general practitioner A. MILNE , civil servant D. PURVES, schoolteacher I. SMYTH , teacher