6.40 Quantum Theory and Atomic Structure

7.5 Circulation of the Blood

7.30 Microfossils

Story: The King's New Crown Written by SHEILA ARCHER Told by Elisabeth Welch Presenters
Floella Benjamin , Johnny Ball
Book, Play School: Ready to Play, £1.50, from bookshops. Play On. record (REC 332). cassette (ZCM 332), Bang on a Drum, songs from Play School and Play Away, record (REC 242, or cassette (MRMC 004), from record shops

4.50 Reading Development

5.15 Stereochemistry - Configurations

5.40 Genetics: The rll System

6.5 M101/10 Area Games

6.30 Atoms and Molecules

Frame of the Day
DAVID viNE introduces an outstanding frame from today's semi-finals, together with news and comment from the World Championship at the Crucible Theatre in Sheffield.
At stake £20.000. as well as the title of World Champion. Commentators
TED LOWE
JACK KARNEHM
CLIVE EVERTON
Lighting JOHN CROWTHER Producer NICK HUNTER

Parts
A film impression of life's seven ages. Hands and feet tell the story of birth to death.
Director PETER BARBER

includes a news summary with sub-titles for the hard-of-hearing, followed by Weather on 2

DAVID VINE introduces a series of ten programmes of interest to rider and spectator alike. 5 : The First Jump
ANNETTE LING takes a group of pupils through the early stages of learning to jump on horseback.
Recorded at Stoneleigh, Warwickshire, and Rockhampton, Gloucestershire.
Producer JOHN DOBSON BBC Bristol

starring
Johnny Mathis at the Royal Albert Hall in London. The second half of an exciting two-part concert recorded for BBC Television during a recent triumphant tour of this country. Musical director JIM GANDUCLIA Solo guitar GIL ROGERS
THE MIKE SAMMES SINGERS
Sound CHRIS HOLCOMBE
Lighting HUGH CARTWRIGHT
Designer ROGER MURRAY-LEACH Production YVONNE LITTLE:WOOD

by the Conservative Party
(Also on BBC1)

A new series of comedy films starring and with Here's
Johnny Brenda 's boyfriend Nick thoughtfully arranges a blind date for Rhoda. The evening is not exactly a riotous success - but at least Rhoda discovers the compensations of loneliness!

Elements of Risk
In October 1956, The Queen threw a switch at Calder Hall in Cumbria. Britain has been producing nuclear power for electricity ever since. But with nuclear electricity has come nuclear waste. Spent fuel elements from reactors have to be changed. They are intensely radioactive.
In April 1979. scientists still do not know what to do with nuclear waste. Today our nuclear stations light one electric lamp bulb in every ten; by the year 2000 it will be one in every two. The waste comes to Windscale, alongside Calder Hall , by the trainload - now from other people's power stations as well as our own. Each wagon's contents have already released 40 times the energy of the Hiroshima bomb. But still locked inside are radio-nuclides that can cause cancer and are indestructible for thousands of years.
America's Harrisburg accident highlighted one kind of nuclear risk; here at Britain's Windscale another kind of risk is run daily. Horizon, for the first time, traces the inner workings of Windscale. What goes on there? What precisely happens to that nuclear scrap? How much is leaking into the environment? Will our descendants, in 500 or 1,000 years' time, bless us for tidy energy conservation or curse us for bequeathing a permanent poison? Narrator PAUL VAUGHAN
Film editor TED WALTER
Editor SIMON CAMPBELL-JONES Written and produced by CHRISTOPHER RILEY

The Embassy World Professional Snooker -Championship
DAVID VINE introduces highlights of the eighth day's play from the Crucible Theatre, Sheffield.
The last four players continue the battle for a place in the Final. Commentators TED LOWE
JACK KARNEHM , CLIVE EVERTON
Producers NICK HUNTER
RICHARD TILLING , KEITH PHILLIPS

PETER DORLING introduces extracts from some of the day's Election speeches.