By Kent County Council
By Pat Bryden
By Harry Smith
By Paul Harling
By School Mathematics Project
By Mel Lever
By Janet Rees, Rees, Janet
By Fentem, Roger, Berry, John, Langham, Sue
By Sue Atkinson, Liz Atkinson
By Elaine Sellers, Sue Lowndes
By Chris Green
By Brian Housden
By David Rayner, Michael White