6.5 Maths - Differentiability. 6.30 Introductory Electronics. 6.55 The Social Primate: Growing Up. 7.20 Meanings of Madness: 4. 7.45 Classical Greece: Games Festivals.

(Repealed on BBCl at 3.55 pm)

Working Together
Co-operation between the parties concerned enables mentally handicapped people to work in an ordinary firm.
Producer CAROLINE PICK
A BBC/Open University production

The Heliconid is a striking black, yellow and vermilion butterfly from South America.
Marian Foster visits the Cotswold Wildlife Park where John Stone explains how to rear these beautiful creatures in your home. He also shows how to look after stick insects and praying mantis. Brian Watkins finds out more about care for your tortoise from Don Reid.
Production assistant SUE FARLEY Producer ANDREW MEIKLE
Executive producer JOHN KENYON BBC Pebble Mill a SEE PAGE 79

Feature film starring Gordon Scott Sean Connery , Anthony Quayle
A band of murdering adventurers in search of a hidden diamond mine are pursued up river by Tarzan and his new companion, the lovely Angie.
Screenplay by BERNE GILER based on a story by LES CRUTCHFIELD Produced by SY WEINTRAUB
Directed by JOHN GUILLERMIN. Films: p 17

A Healthy Future?
Following public reaction to three Open Space films about the NHS, tonight's programme presents a major debate about the future of the Health Service. The participants all have a vital stake in the issues-whether as doctors or nurses, porters or patients. Chaired by MARGO MACDONALD
Director TOM CORCORAN Producer GILES OAKLEY
Made by the COMMUNITY PROGRAMMES UNIT

The 1983 International Hong Kong Dragon Boat Festival.
Two thousand years ago the Chinese poet and statesman Chu Yuan threw himself into a river as a protest against corruption. The local fishermen took to their boats, splashing with their oars and tossing dumplings into the water to distract the monsters and fish from the hero's body.
In Hong Kong they continue to keep this appointment with tradition on the fifth day of the fifth moon. Now it is an international event attracting nine overseas teams, including Great Britain, as well as around 80 local teams. Narrated by DAVID VINE
Videotape editor DAVID JONES Assistant producer DAVID ROSS Producer PETER HYLTON CLEAVER

Six films of early exploration
Introduced from the Royal Geographical Society by the pioneer polar explorer Duncan Carse

'Congratulations Cobham! Magnificent show: now sit down and tell me all about it.' - the words of King George V to the pioneer aviator Sir Alan Cobham, on his return from his great trail-blazing flight from Croydon to Cape Town and back.

Cobham had taken off from Croydon aerodrome in a primitive single-engined De Havilland biplane on a grey November morning in 1925. Ahead stretched a journey of some 8,000 miles - all dependent on that single engine: a flight which was to include the first aerial photography of the pyramids; getting lost in a sand-storm; landing among tribes who had never seen an aeroplane before - and nearly crashing into the Victoria Falls when spray swamped the engine.

At the end of it all, a triumphal welcome in Cape Town, a unique picture of an Africa now long since vanished: and the royal command to 'tell me all about it'.

written by RAY CAMERON
BARRY CRYER , KENNY EVERETT
Everett's last series starts its repeat run tonight. See Kenny try to remember the jokes from last time! Hear the screams of the studio audience beating on his dressing-room door! Watch as Kenny refuses to let them out! All this and less in tonights bonanza of biffs, boffs and banter.
Designers MARTIN COLLINS , DAVID HITCHCOCK Producer BILL WILSON

by ANGUS WILSON
A version for television in five parts by TROY KENNEDY MARTIN 1: A Tall Story
When Smokey the giraffe goes berserk, the consequences exceed Simon Carter 's worst fears. A clutch of fanatical old men, a power-hungry Press baron and an international crisis conspire to make his first day as Secretary of the National Zoo a most bizarre experience.
Music composed and conducted by SIMON ROGERS
Lighting JOHN KING
Script editor BETTY WILLINGALE Designer
CHRISTOPHER ROBILLIARD
Producer JONATHAN POWELL Directed by STUART BURGE
* Subtitles on Ceefax page 270

The last in the present series from the Wembley Arena which was once again the shrine for Britain's country fans, for the International Festival of Country Music.
David Allan presents the musical high spots, and talks to a couple of the personalities involved, including star of the festival Boxcar Willie.
Also featured tonight are Margo Smith , Roy Drusky Terry McMillan and Foster and Allen.
Festival organiser MARVYN CONN
Sound BARRIE HAWES , JOHN CAULFIELD Lighting JOHN KING
Producer DAVID PERROTTET

11.35 Imaging the Eye
Techniques for diagnosing a tumour
12.0 The View from Detroit
A dramatised discussion of Chrysler Corporation's decision-making during a crisis In 1975.