6.45 Visual Illusions: Now You See It

7.10 Topology: Winding Number

7.35 Work, Energy and Power

8.0 Ecology: The Pine Beauty

8.25 Homogeneous Catalysis

(to 8.50)

Ben Thomas , Jane Hardy
Howard Lee and Alison Rose say Hallo Again
Story: Me and My Flying Machine by MARIANNA AND MERCER MAYER Musicians
LAN SMITH, PETER HOWLAND Director ALISON STEWART
Editor CYNTHIA FELGATE (R)

Self-sacrifice
Alan Rothwell , Linda Nolan and Alan Parnaby with songs and stories about taking risks to help each other. Director CELIA THOMSON Producer JUDY MERRY BBC Manchester (R)

A simple service of prayer and meditation in which viewers throughout the country are invited to take Part. Join
Margaret Collingwood in the home of Carol Dorrington Ward, in Maida Vale, London.
Simon Hughes, MP, speaks about Responsibilities to God's Treasure.
Directed by STEVE BENSON
Series producer DAVID CRAIG

SabRas
For the next four weeks
Asian Magazine goes musical with compilations of song and dance from previous Programmes.
Artists this week include: Nazia Hassan , Ustad Sabri
Khan, Pankaj Udhas , Lohana Community Dancers and the Surnai Group of Rajasthan. Producer KRISHAN GOULD
Executive producer ASHOK RAMPAL BBC Pebble Mill

Sixth of eight programmes
Narrated by Anthony Quayle The House of Peers
Written by CHRISTOPHER JONES Executive producer JOHN GAU Producer ALAN SCALES
* CEEFAX SUBTITLES

On the lakes of East Africa, flamingos in thousands, flotillas of white pelicans, weaver birds and love-birds nesting alongside wintering swallows.
Narrator Douglas Leach Photography EWART NEEDHAM Film editor MICHAEL STEVENS Producer KEITH HOPKINS
BBC Bristol

Summer
July is a critical month for
Richard Seabrook , shepherd and freelance farm worker. On the third Friday he takes his lambs to the sale at Bury St Edmunds. The financial success or failure of a year's work is largely decided by prices on this one day. Narrator Barry Paine Photography ARTHUR SMITH Written and produced by DON HAWORTH
BBC Manchester

A fortnightly magazine for people who are deaf and hard of hearing. With sign language and subtitles. Introduced by Maggie Woolley , Clive Mason and John Lee
Producer CHARLES PASCOE (E)

with Philip Wrixon Dan Cherrington Leslie Cottington and Claire Powell Producers
KEN POLLOCK. MARTIN SMALL
Executive producer JOHN KENYON BBC Pebble Mill

starring
The Grand Swing
Jamie expects to be punished for a piece of foolishness, but Ben takes him around the vast acres of the Ponderosa where the youngster is given a lesson in growing up.
Written by WARD AND JOHN HAWKINS Directed by WILLIAM F. CLAXTON (R)

by Tony McHale and Peter Batt.
'In two weeks me and mum are moving out'.
(Ceefax Subtitles)

continuing a season of films starring the distinguished and much admired British actress.
Today with Spencer Tracy
The immmensely wealthy Sir Arnold Boult looks back from among the ruins of a life to a time of harmony and optimism. Evelyn and Arnold, young and in love, have just had their first child,
Edward, and their joy transcends their relative poverty. But Arnold's wish to give the boy the best of everything becomes an utterly destructive obsession....
Screenplay DONALD OGDEN STEWART From the play by ROBERT MORLEY Produced by EDWIN H. KNOPF Directed by GEORGE CUKOR
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The Long Straight with Michael Frayn
From Sydney to Perth the line goes all the way from the Pacific to the Indian Ocean. It crosses most of the history of Australia, as well as the geography.
Producer DENNIS MARKS BBC Manchester
* CEEFAX SUBTITLES

The video eye on nature with Michael Jordan Nick Davies and Peaches Golding
The young swifts do press-ups, exercising their wing muscles for three years of non-stop flight. Intricate and active, a bumble-bee nest comes underdose scrutiny. Is Archaeopteryx a fake fossil? And Nick makes a balloon flight across The Wash to survey seals.
Producer MIKE BEYNON BBC Bristol

with Richard Whitmore Weather News

For the last programme in the present series,
Cliff Michelmore travels to the Border country to meet Catherine Cookson , perhaps Britain's most popular novelist. Catherine talks with characteristic honesty about her childhood in Jarrow, her life in the workhouse, her breakdown and, of course, her success as a story-teller. 'It's something that I've been given, a wonderful gift to be a story-teller ... I know what I value: I value peace of mind, I want spiritual peace.'
Catherine's choice of music is Performed in the Galilee
Chapel of Durham Cathedral by members of the SINFONIA CHORUS and the NORTHERN SINFONIA STRING ENSEMBLE.
It includes 'Bless this house', Massenet's 'Meditation' and 'Amazing grace'.
Soloist GILLIAN WEBSTER Conductor ALAN FEARON Assistant producer
LELIA GUINERY. GREEN
Producer NOEL VINCENT
Series producer STEPHEN WHITTLE
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starring
Darren McGavin Robert Vaughn
Pamela Bellwood
High above the earth and witnessed by two space-shuttle astronauts, something smashes into a satellite destroying it, before hurtling to the earth itself. It crashes in the Arizona desert and is transported under maximum security to a remote airplane hangar on an abandoned Air Force base in Texas. NASA blames the satellite's destruction on the astronauts.
What is really inside Hangar 18? The astronauts say it's a UFO, and the government wants to keep them quiet - at any cost!
Frank Morrison .PHILIP ABBOTT Screenplay by STEVEN THORNLEY
Produced by CHARLES E. SELLIER JR Directed by JAMES L. CONWAY
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with Richard Whitmore Weather News

by ALAN BERRIE starring Dermot Crowley Robert Urquhart Linda Marlowe
The guv'nor lies upstairs blind drunk. The guv'nor's wife is out on the town with her latest boyfriend, while Denis, the Irish barman, slaves single-handed to keep The Queen's Arms afloat.
But with the Falklands war about to break, perhaps life may become even more tricky for poor Denis ...
Pianist ..............ALBERT WELCH Music by jeu PARKER
Lighting supervisor GEOFF STAFFORD Videotape editor STEVE EVELEIGH Designer JOHN BONE Directed by ROBERT COOPER and GARTH TUCKER Producer ANDRÉE MOLYNEUX
* CEEFAX SUBTITLES

Introduced by Rabbi Julia Neuberger
Whose Life is it Anyway? Last month the world's population reached five billion for the first time. Yet in the West, the decision whether or not to have children has become an option as never before.
Tonight Julia Neuberger asks 'why children?'.
What should we do with and for our children? Whose responsibility is it to set a moral lead - parents' or schools'? Whose responsibility is their education - parents' or the state's? Should parents make allowances for children's rights?
In the studio are The Rt Hon Shirley Williams , former
Labour Secretary of State for Education and co-founder of the SDP; The Rt Rev
Monsignor Michael Connelly , Secretary of the Catholic Child Welfare Council;
Valerie Riches , National Secretary of Family and Youth Concern; and Simon Salzedo , joint winner of the Observer Mace Debating competition.
Director SIMON HAMMOND
Series producer JAMES MURRAY

A Bird Walk with Bill Oddie
Fair Isle is the setting for the fourth programme of British walks.
Islands are wonderful places to watch birds, and Fair Isle attracts many rare migrants - and birders like Bill Oddie , who shows that this is not a recreation for the impatient. You can have a long wait before you spot a crippler, but meanwhile you can always just enjoy the walk.
Photography MARTIN SINGLETON Producer MIKE WEATHERLEY (E)
For free leaflet, produced with the English Tourist Board, send sae (220mm x 110mm) to Favourite Walks, [address removed]

The 1986 Shell Oils British Motorcycle Grand Prix from Silverstone
Today sees round nine of the 11-race series, which the riders consider to be the crucial one towards the outcome of the 500cc World
Championship. Among those competing are three times runner-up RANDY MAMOLA , popular British-based
Australian WAYNE GARDNER and this year's favourite for the title EDDIE LAWSON , who has never won at Silverstone. Commentators
MURRAY WALKER
BARRY SHEENE
Producer KEITH MACKENZIE