7 40 Mugging

8.5 Light - In Search of a Model

8.30 M101/9 Iteration Convergence

8.55 Optical Microscopy

9.20 Fractional Distillation

9.45 Cells and Organisms

10.10 Frequency Response

10.35 Enthalpy

11.0 Database: Standard Telephones

11.25 Open Lecture: 1

11.50 Mechanics -Particles

12.15 Air Traffic Control

12.40 Sundials

1.5 Avoiding a Catastrophe

1.30 About Frequency Response

Five lectures from the Royal Institution on a theme for the 80s. 4: The Rt Hon Shirley Williams , Senior Research Fellow, Policy Studies Institute.

The Melrose Sevens
This tournament, devised by Ned Haig in 1883, is the oldest in the world. Held on the second Saturday in April each year at the picturesque Greenyards ground, the ' sports ' are considered the ' Blue Riband ' of the game.
Scotland's top sides, plus guests London Scottish and Richmond, will battle it out this year for a prized Melrose Medal.
Commentator at Melrose
BILL MCLAREN .-Introduced by Nigel Starmer-Smith
Series producer HUW JONES
A selection of original Sporting Themes (record REH 348, cassette zcr 348), from record shops
The World of Rugby, £0.25, from bookshops followed by Rugby League results

plus a visual commentary for those who cannot hear. with Richard Whitmore
Editor RICHARD GAMBLE

Peter Hobday reports on the people and events that affect your money, your job and your business affairs.
This week the latest trade figures will be published and Nick Clarke looks at Britain's export record. Which products sell best? Are small companies exporting their sales as fast as the multi-nationals? At present the top 250 companies are responsible for almost two-thirds of all our exports. So, is exporting really for the big companies alone?
Deputy editor CLIVE SYDDALL Editor PAUL ELLIS

On the Rock Face
Rock climbers call the sun-baked walls of California's Yosemite Valley, vertical desert; vast slabs of rock soar up from the valley floor shimmering in the desert heat. Of all the rock faces El Capitan is the most awe-inspiring. Its summit overhangs the valley floor 3,000 feet below. This award-winning film follows the three days that three climbers spent perilously ascending the rock face. It is tense and exciting.
Film cameraman GLEN DENNY Produced by FRED PADULA
Presented by SIMON NORMANTON Series editors ANTHONY ISAACS and PETER JONES

Weather

The film version of the musical by SIGMUND ROMBERG starring .
Ann Blyth , Edmund Purdom and the singing voice of Mario Lanza
Prince Karl, heir to the throne of Karlsburg, enjoys his first taste ot freedom when his father sends him to Heidelberg to finish his education. Unfortunately he also acquires a taste for beer and the virtues of the innkeeper's daughter, pleasures which are incompatible with his royal duties.
Produced by JOE PASTERNAK
Director RICHARD THORPE. Films: page 21 (First showing on British television)

An anthology of songs that never made the charts. Yet they are some of the most provocative and entertaining songs of the 70s. Satirical, polemical, rousing, sad, originally written for the theatre and probing different aspects of the welfare state we're in, from love and marriage to law and order.
These songs are the fringe benefits of that thriving development, outside traditional theatre, of small community theatres and travelling companies, taking plays and music to often non-theatre-going audiences in venues ranging- from factories to social clubs.
The songs are written and performed by past and present members Of THE ALBANY COMBINATION
BELT AND BRACES
THE RED LADDER THEATRE CO and THE SADISTA SISTERS.
Sound recordists
JOHN MURPHY , BOB ROBERTS
Lighting cameraman COLIN WALDECK Film editor SHELAGH BRADY
Executive producer PETER ADAM Directed by MICHAEL DIBB

starring
Jeff Bridges , Barry Brown
In his desperate attempt to escape Civil War recruitment, young Drew Dixon decides to head west - hoping to find fame and fortune. Unfortunately, Drew's first encounter is with Jake Rumsey and his gang of juvenile outlaws. Together they begin the journey from Ohio and their descent into lawlessness.
Robert Benton , most recently director of Kramer vs Kramer, creates a Western odyssey that is intermittently elegiac, savage, and resonant with myth. It is one of the most hauntingly beautiful movies of the past decade.
Screenplay by DAVID NEWMAN and ROBERT BENTON Produced by STANLEY R. JAFFE Directed by ROBERT BENTON
(First showing on British television) Films: page 21