6.50 Urban/Rural Relationships
7.40'The God that Rules'
8.05 Community Education in Belfast
8.30 Minerals under the Microscope
8.55 Calculus: Functions and Graphs
9.20 Cogs in the Wheel?
9.45 Arts: Handel's Messiah
10.10 Education: Let There Be Music
10.35 Maths: Least Squares
11.00 Studying with the Open University
11.25 Light-Waves or Particles
11.50 Maths Methods: Linear Equations
12.15pm Biology: The Rod Cell
12.40 Education: Old Dog, New Tr.ck

Easter Island: the Secrets
Can the mystery of Easter Island's giant statues ever be solved? Who built them, how and why - and what happened to the civilisation that once flourished there? In the first of a two-part investigation, Horizon pieces together the clues that can reveal the secrets of a vanished past.
Narrator Andrew Sachs Producer JOHN LYNCH
Horizon editor ROBIN BRIGHTWELL
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Introduced by Nigel Starmer-Smith with CHRIS REA
Courage English
Championship Division 1 Orrell v Waterloo
Orrell have been struggling in the relegation zone for most of the season whereas Waterloo have always threatened the top clubs
- so the result and the four points are very important to both sides in this north-west clash.
Neath v Cardiff
New favourites for the Welsh cup, Neath take on last year's holders Cardiff in what should be an exciting open match.
News and comment on the rest of the weekend's action. Series producer Huw JONES

Introduced by Steve Rider Timetable*
3.00 Football
3.10 Snooker
4.30 Football
5.00 Athletics
5.20 Snooker
*Timings are subject to alteration Football from Wembley Stadium
Mercantile Credit Football League Centenary Festival
Highlights of the final stages of this 11-a-side, 30 minutes each way, 16-team knock-out competition.
'Happy birthday to you, happy birthday to you....'
Commentators BARRY DAVIES and TONY GUBBA
Athletics
Mars London Marathon
This bit's a dawdle (the winner's interview); the torture
(26 miles 385 yds) is on BBCl. Snooker from Sheffield
World Professional Championship Commentators
TED LOWE , JACK KARNEHM and CUVE EVERTON Television presentation:
Football TSL for WORLD WIDE SOCCER Snooker KEITH PHILLIPS
KEITH MACKENZIE. WENDY SHEPPARD Studio producer CAMPBELL FERGUSON Assistant editor BRIAN BARWICK Producer MARTIN HOPKINS Editor JOHN PHILIPS

with Brian Widlake and Valerie Singleton Eurodreams
Within five years all of Europe's trade barriers should have been swept away. For British businessmen, will 1992 be a threat or an opportunity? Paul Burden reports. Producer GLYNN JONES Editor JONATHAN CRANE
Studio director SUE TURBETT

Survival on the hot plains of Africa is a tightrope between life and death, even for the big cats. The leopard is a shy and elusive prowler, seldom seen by visitors to Kenya's most magnificent game reserve, the Masai Mara. The extraordinary and hazardous events in the daily life of one particular leopard and her cubs. Her wariness of elephants, a clash with a ' cheetah for possession of prey, and the threat from lions that could easily kill her cubs, show that even this powerful predator takes part in the continual struggle for life. Photographed and produced by HUGH MILES
Series editor PETER JONES BBC Bristol
(First shown in 'The Natural World;

An eight-part series
7: The City under the Sea
Narrated by Tim Pigott-Smith The classical world of Greece and Rome is rife with stories of destruction and of great cities like Atlantis being lost and swallowed up by the sea. But one of the greatest sunken cities lies not in the Mediterranean, but across the Atlantic, in the New World.
Port Royal, Jamaica, was the centre for buccaneers who raided Spanish galleons laden with treasure.
Under the leadership of the famous pirate Captain Morgan, Port Royal came to be known as the Sodom and Gomorrah of the New World, the wickedest city on earth. But in June 1692, an earthquake devastated the town. Over 3,000 people were killed or drowned, as the city slipped beneath the sea.
Today, a team of divers led by Dr Donny Hamilton from
Texas A and M University is uncovering the town. Film editors
JEFF SHAW. HORACIO QUEIRO
BBC dive team: Film cameramen JOHN BECK. BRIAN MARDEN JONES Series editor BRUCE NORMAN Written and produced by DEREK TOWERS
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In the final edition of this television review
Ludovic Kennedy and guests discuss selected programmes and Spitting Image producer John Lloyd looks at the proliferation of TV programmes about TV. Film direction ARCHIE BARON Studio director KATHY MYERS Producer NICHOLAS BARKER

Programme four of the series in which Eartha Kitt introduces vintage performances from some of the greatest black artists of the 20th century, all filmed in the early 1950s before the notoriously tough audience of Harlem's world-famous Apollo Theatre.
Tonight's programme includes doo-wop harmonies from male vocal group the Larks; jazz and R'n'B from sassy Sarah Vaughn and Nat 'King' Cole; high-speed tap from Little Buck; comedy from Leonard Reed with Freddie and Flo; and a sublimely sleazy rendition of the boozers' ballad, One for My Baby, by the immortal King of Hi-De-Hi, Mr Cab Calloway.
Cameraman JOHN MCGLASHAN Sound MICHAEL SPENCER Film editor DAVID KITSON
Producer HELEN GALLACHER

Embassy World Professional Snooker Championship Round 1
MIKE HALLETT concludes his first-round match against BOB CHAPERON.
Meanwhile, TONY KNOWLES will be starting out on the long trek with an opening session that concludes tomorrow night - against DANNY FOWLER.
DAVID VINE warms up with further coverage from the Crucible Theatre in Sheffield. Commentators TED LOWE
JACK KARNEHM , CLIVE EVERTON Television presentation MIKE ADLEY WENDY SHEPPARD. PETER HAYWARD Producers
KEITH MACKENZIE. KEITH PHILUPS