Introduced by Johnny Ball
The second semi-final, with Radio London Ian Stephens
Radio Nottingham Lionel Reyes Radio Solent Bob Curl competing for a place in next week's final for the Hartmann Fibre Trophy.
Hilary Henson reports from the London Transport Museum.
Teams from BRITISH NUCLEAR itels, IMPERIAL METAL INDUSTRIES and INTERMEDIATE TECHNOLOGY DEVELOPMENT GROUP are set a problem to ' sort out' by judges Heinz Wolff and Professor Gordon Higginson.
Production assistant DANAPURVIS Director PAUL LOOSLEY Producer PETER BRUCE