9.52 Look, Look and Look Again: Bits and Pieces
In Wiltshire, children examine light and dark; in Leeds they make a model city of the future and film a story set there.
(R) (e)

10.15 Look and Read: Dark Towers: 9: Who Can Help?
by Andrew Davies
(R) (e)

10.38 Investigating Science: Prediction: If It Happened Once
Is there a pattern in the way our demand for electricity fluctuates or the tide ebbs and flows? What repeating pattern in Jenner's observations led to the discovery of immunisation?
(R) (e)

11.00 Watch: Peter and the Wolf and Drums
(For details see Thursday at 2.00pm) (R) (e)

11.18 Wondermaths: 9
Why is it getting so hot inside the Investigator? And what do Hudson's flowers have to do with the crisis?
(R) (e)

11.35 MI 10: Mathematical Investigations
Get the Facts
'Men are taller than women.' Always? How might you test such a statement?
followed by Rolling
Stonehenge, a 50p coin and a drill that creates a square hole.
(R) (e)

12.00 Maths Topics: Statistics (4)
Probability from relative frequency; Thames flooding; seed testing.
(R) (e)

12.20pm Textile Studies: Riot of Colour
Sir Terence Conran shows how to select a fine piece of dhurrie weaving, and Keith visits a fabric-printing works. The pupils of Clowne Secondary make eye-catching fabric pictures.
Presented by Keith Chegwin
(R) (e)

12.50 Micro File 2: Computer-Aided Doctors
(R) (e)

A See-Saw programme
(R)

1.38 Outlook: Alternative Technology: What Future?
(R) (e)

A series for 4- and 5-year olds.
Jeni Barnett finds it hard to comfort Cosmo when Dibs goes missing. Meet the number 10.
Book: "Winklet Goes to School"
(R) (e)

In this new series Richard Blizzard shows you how to make your own wooden toys. He starts with a perfect project for the beginner: a super scoot-along biplane, designed to be flown indoors or out and sturdy enough to survive the odd crash landing!

Book, 'More of Blizzard's Wooden Toys', £10.95 from retailers
Info: page 97

Weather followed by International Snooker The Tennents United Kingdom Championship
The last two quarter-final places are to be decided this afternoon. Favourite on Table 1 must be former world champion CLIFF THORBURN , having overcome
GRAHAM CRIPSEY in Round 3. The seedings predict his opponent will be Welshman
DOUG MOUNTJOY but he might well have fallen foul of Australian JOHN CAMPBELL or newcomer JIMMY CHAMBERS. DAVID VINE introduces the play from the Guild Hall,
Preston. Commentators TED LOWE. JACK KARNEHM CLIVE EVERTON
Summahsers JOHN SPENCER JOHN VIRGO. EDDIE CHARLTON
Television presentation
KEITH MACKENZIE , PETER HAYWARD Producer KEITH PHILLIPS
Executive producer IAN EDWARDS

Desmond Lynam takes pleasure in inviting his guests to unlock the film and video vaults with their personal memories of past television moments. Today s guest is Thora Hird whose choice includes W:<M the Boa<CoM<M/M, Open All
Hours and Romeo and Juliet.
Producer PHIL CHILVERS

The Tennents United Kingdom Championship ...
DAVID VINE introduces further coverage of the matches in this year's championship from the Guild Hall. Preston.

(Shown yesterday on BBC1 at 11.05pm)

Yorkshire Dales
Jenny PoweII, Tony Baker and the world's fastest rock show visit Swaledale and Wensleydale, part of North Yorkshire known as 'Herriot's Country' since the success of the BBC series All Creatures Great and Small.
As Jenny and Tony discover, 99 per cent of those creatures are sheep, so nobody mentions mint sauce. But that still leaves plenty to talk about: pop videos, the UK and US charts and powerplays.
Associate producer JONATHAN KING Production PETER HAMILTON BBC North West
(Shown also this Sunday)

This morning the competitors in this year's
Lombard RAC Rally passed through the forests of north Yorkshire before entering
Northumberland's notorious Kielder Forest complex at dusk. WILLIAM WOOLLARD introduces action from the day's early stages with commentary from
BARRIE GILL. SUE BAKER reports live from the Kielder Forest Service Area with the latest information on the cars and drivers.

If God was going to give the meaning of life to someone, I don't think he would give it to Pop stars.
Billy Bragg , the self-effacing pop star prophet discusses his views on politics, the pop music industry, drugs and morality.
Presented by John Nicholson Researcher MARK HAGEN
Director DENNIS COSGROVE Producer STEWART LAMONT BBC Scotland

Sixth of eight programmes on making music in a rock band. Everything You Wanted to
Know about Rhythm but Were Afraid to Ask
Deirdre Cartwright (guitar) Alastair Gavin (keyboards) Geoff Nicholls (drums) and Henry Thomas (bass) Comments from
Selwyn Brown of Steel Pulse and the one-and-only Jools Holland
Researchers DAVID SINCLAIR , TIM LAMBERT Production assistant ADELE RAWNSLEY
Produced by CHRIS LENT (e)

Presented by Chris Kelly
Michael Barry , Jill Goolden Service compris? Service charges - tips to some - are not compulsory, but many restaurants make out they are. There's a new campaign to end this malpractice.
Tonight's special recipe is for delicious home-made ginger beer, a low-alcohol drink for the party season. Catering will be Britain's biggest business by the year 2000 but what sort of food will it turn out? TV cook and food writer Glynn Christian calls for some radical reforms. Film directors
WILFRED EMMANUEL-JONES. STEPHEN LAMBERT
Studio director JEREMY MILLS Producer PETER BAZALGETTE
0 RECIPE TIMES: page 102

Fag Ends
Smokers are a shrinking minority in Britain, yet non-smoking workplaces are still the exception rather than the rule. Last week Brass Tacks disclosed that non-smokers who live or work with smokers run a greater risk of contracting lung cancer. Yet the Government, employers and trade unions continue to fight shy of drastic measures to restrict smoking in public places.
Tonight John Harrison asks Brass Tacks viewers and professional campaigners just how far measures to protect non-smokers should go, or do smokers, too, have the right to choose?
Studio director ROBERT KHODADAD Producer DIANNE NELMES Editor COLIN CAMERON BBC North West

Vancouver
Yes, this series is called
Entertainment USA and yes, Vancouver is in Canada, but it is an incredibly beautiful city. People say it's a bit like Hong Kong. Lots of things go on there, and it is just over the border from Seattle. So
Jonathan King sneaks up to take a look.
Film cameraman MIKE RADFORD Film sound SIMON WILSON Film editor LIZ TENNENT
Videotape editor ROGER MARTIN Produced and directed by GORDON ELSBURY

The Lost City of the Incas
(Hiram Bingham 1878-1956) Presented by David Drew Suddenly I found myself confronted with the walls of ruined houses built of the finest quality of Inca stonework. Itfairly took my breath away. What could this place be?
Hiram Bingham was a young American who, in 1911, set off into a remote, unexplored part of the Peruvian Andes.
He was searching for the last refuge of the Incas, a city that was a treasure house of ancient riches and which, according to legend, the Spanish conquistadors had never found.
After only a week, Bingham was to discover the spectacular ruins of Machu Picchu, perched on a forest-clad mountain top. It is the most romantic archaeological site in the world, but is it, in fact, the true lost city?
David Drew follows
Bingham's trail from Cusco, the ancient Inca capital, through mountain peaks to Machu Picchu and the jungles beyond and attempts to resolve the mystery.
Voice of Hiram Bingham William Roberts
Photography JOHN GOODYER
Film editor STEVE BOTTOMORE Series editor BRUCE NORMAN
* CEEFAX SUBTITLES

It's the third day of the 1987 Lombard RAC Rally and the competitors have reached the overnight halt at Carlisle.
WILLIAM WOOLLARD introduces full coverage of today's action with commentary from
BARRIE GILL and behind-the-scenes news and views from SUE BAKER and TONY MASON.

The last word on world events analysed by Peter Snow Donald MacCormick and Adam Raphael with political and economic reports from Will Hutton and Nick Clarke