6.5 Maths: Orthogonal Bases. 6.30 PeUcan Crossings. 8.55 Migration from a Turkish Village. 7.20 Social Science: Getting it Together. 7.45 Intervention in the Market

JULIAN WILSON introduces four races run on the New Course, featuring the Tote Cheltenham Gold Cup, worth over
E50,000 to the winner. Trainer Michael Dickinson fields the strongest team in the 60-year history of the race, including last year's first and second, Silver Buck and Bregawn.
2.15 The Daily Express Triumph Hurdle Race (2m)
2.50 The Christies Foxhunter 'Chase Challenge Cup (3m 2f)
3.30 The Tote Cheltenham Gold Cup (3m 2f)
4.5 The Ritz Club National Hunt Handicap Steeplechase (3m If) Commentators PETER o'sullevan and RICHARD PITMAN
Reporter JONATHAN POWELL

Set in Cadbury's Birmingham chocolate factory, the film contrasts preparation for repetitive production work with personal fulfilment through a liberal philosophy of education.
Producer DAVID THOMPSON
A BBC/Open University production

A classic cliffhanger in 15 chapters
Chapter 8: Bombs Away
Lance and Claire meet with an explosive and deadly deluge on their return to Mystery Island.

Window Shopping
A classic COLUMBIA cartoon

A series in nine parts
Episode 2: by BARRY PURCHESE
Tucker prepares for a job interview while Alan dreams of rekindling an old romance.
Series devised by PHIL REDMOND Film editor MICHAEL GOLDSMITH Film cameraman DAVID SOUTH Designer JOHN COLEMAN
Producer DAVID HARGREAVES Director CHRIS MENAUL

with subtitles, followed by Weather

Highlights of the National Hunt Festival featuring the Gold Cup and the Daily Express Triumph Hurdle

A weekly look at wildlife and the issues affecting the living world with Tony Soper , Jeremy Cherfas and Anthony Smith. The Outer Hebrides stand to benefit from a £60 million EEC development plan. But are the needs of the island's wildlife being taken into account?
Producer ROBIN HELLIER
Editor JOHN SPARKS. BBC Bristol

The first of six programmes

A hundred years ago the father of modern Communism died in north London. From his grave in Highgate Cemetery Karl Marx inspired the Bolshevik Revolution in Russia, and even today he inspires revolutions the world over. The young Marx proclaimed, 'the philosophers have sought to interpret the world in various ways; the point, however, is to change it.'
Written and presented by Asa Briggs
Film cameraman Colin DEEHAN Sound FRED DOWNTON Editor AUGUSTE NUNES Producer IAN TAYLOR Executive producer JOHN DEKKER

Travel is the theme tonight. Starring Juan Martin
Julie Kirk and, for the first time on British television,
Canada's number one group The Nylons
LUKE BATCHELOR, RICHARD CALKIN WAYNE FOWKES , GARY FORECAST ANTHONY JOHNS , JOHN WILLETT
Choreography DOUGlE SQUIRES. Musical director JOHN COLEMAN. Sound MIKE MC CARTHY. Lighting I)ICKIE higiiam. Designer TONY BURROUGH. Producer BRIAN WHITE -
HOUSE
Executive producer ROBIN NASH

Laid back, lively, laconic, lascivious, sometimes lethal but never licentious, nor it's hoped, late for his live loquacious half-hour. Have an 'L' of a time with Russell Harty.
Director JOHN ROONEY
Producer FIONA JOHNSTON BBC Manchester

The first of six Forty Minutes documentary programmes filmed at the Bristol Cancer Help Centre. Every Wednesday a new group of patients arrives for a two-day crash-course in self-healing. Some are here as a last resort, others are rid of the disease and wish to prevent its recurrence. There is no radiation, no chemotherapy, no surgery, but a philosophy designed to fight the disease from within by harnessing the power of the mind, body and spirit to destroy the malignant cells. The Centre never uses the word ' cure '; it speaks only of ' getting better'
Film cameramen BRIAN HALL , DAVID SWANN , ANTHONY BRAGG Film recordists RON CRABB , GEORGE CASSIDY , DON MARTIN Film editor PETER SYMES Executive producer ROGER MILLS
Producer ANN PAUL

David Jessel and Jane Walmslcy sift what's important, outrageous and relevant this week.
Legal comment Michael Molyneux
Studio director PIETER MORPURGO Producer RITCHIE COGAN Editor PETER CHAFER

11.30 Woodland Decomposers. Fungi and soil insects are investigated in their natural habitat and in the laboratory.
12.5 Social Psychology Laboratory
Professor Laurie Taylor conducts a guid'ed tour of the York University Social Psychology Laboratory.