Memory, recall, speed, concentration. These are just some of the qualities required of a contestant entering Mastermind.Four such Masterminds appear tonight in this fourth heat which comes from the City University in London. The contenders are:ANDREW WOOD, sales assistant - Life and Works of Dante Gabriel RossettiGEOFFREY REYNOLDS, image intensifier tester - Life of Sir Francis DrakeHAZEL margin, project engineer - Lady Members of the House of CommonsSIR DAVID HUNT, retired ambassador - British Campaigns in North Africa -World War II