Ends 8.15.

Ocean Odyssey
Jason and Brett finally venture inside the spaceship. (R) (S)

7.25 Histeria
The Renaissance is revisited in the animated guide to history. (R) (S)

7.45 Get Your Own Back
More adults face revenge at the hands of their children. Hosted by Dave Benson Phillips and Lisa Brockwell. Shown yesterday at 4.10pm on BBC1 (S) (W)

Ends 10.50.
Bob the Builder: Wendy's Surprise Party
Wendy holds a surprise party - but the machines are too tired to go.
BBC Bob The Builder magazine £1.40 New issue on sale now.
CD-Rom, for PC and Playstation, price £19.99; Bob the Builder - Fix It Fun! on Game Boy Colour, £24.99

8.25 The Story Makers
What is in the mysterious box left behind by the librarian?

8.40 Clifford the Big Red Dog
Cleo gets stage fright when Emily and Charley put on a show.

9 00 Teletubbies
Double bill. The pals watch Tamzin Griffin pretend to be Funny Lady, then they make too much toast.

9.50 Playdays
Fun and frolics at the Roundabout Stop with Why Bird, Poppy and pals.

10.10 Tweenies: Mixed Up Animals / Max's DIY Day
Double bill. Max's surprise doesn't work out as planned, then he tries to build a Wendy House.

Repeats are not indicated.
10 50 Come Outside (ages 4-5) Carrots 4060415 11.05
Numbertime (ages 6-7) Addition and Subtraction - Two Step Addition 4681960 11.20 Words and Pictures Plus (ages 6-7) Long Vowel Spelling - Ee/Ea - with Pamela Alien 's story MrMcGee Goes to the Sea.
11.35 Cats' Eyes (ages 5-7) The Environment - Life in the Water 8325298 11.50 Hands Up! (ages 5-7) Who's in the Shed?! With sign language. 2145347 12.05
Pod's Mission (ages 7-9) Growing Plants 1108637 12.20 Maths Challenge (ages 9-10) TV Workout Year 5 - Programme 4 -questions on decimals.

Business roundup.

A double bill of sport, in which Clare Balding presents coverage from Epsom of the 2pm and 2.30 races. Willie Carson , Jim McGrath and Jimmy Lindley commentate. While at the Crucible in Sheffield, Dave Harold takes on Anthony Hamilton. Coverage of both events continues at 4pm. Racing producer Gerry Morrison

Events at Westminster, including Prime Minister's Questions.

(Digital: BBC London News)
Weather

Hazel Irvine and Steve Davis host as their co-presenter and 1991 champion, John Parrott, takes on fellow former title holder Mark Williams.
Also featuring the 4.15pm race from Epsom.

Homer the Smithers. When Smithers is ordered to take a vacation, he chooses Homer to work as Burns's personal assistant-with unexpected results.

John Higgins , 1998 world champion and winner of four tournaments this season, begins his title campaign with a match against James Wattana of Thailand, twice a world championship semi-finalist. Coverage is introduced by Ray Stubbs and Steve Davis.

With changing attitudes to the drug, and the possibility of relaxed legislation, cannabis cafes could soon appear across the UK. This Money Programme film follows Jimmy Ward , who is hoping to open an outlet in Bournemouth,
Dorset, as he visits Holland to learn the tricks of the trade. Producer KayeGodleman: Series editor Clive Edwards

Further action from the encounter between John Higgins and James Wattana , presented by Ray Stubbs and John Parrott. Commentary comes from Clive Everton, Ray Edmonds ,
Dennis Taylor , John Virgo and Willie Thorne.

The last in a three-part study of who controls the nation's eating habits - the consumer or the food giants.
Trolley Trouble. Chefs Jamie Oliver , Antony Worrall Thompson , Raymond Blanc , comedian Jenny Eclair and Sainsbury's chief executive Sir Peter Davis are interviewed for a report on the supermarket revolution. With 75 per cent of the nation's food purchased from the big four chains - Tesco, Sainsbury's, Safeway and Asda -the programme looks at how they conquered the market and who lost out.
Producer Nick Hudson ; Series producer Lucy Hillman

The last in the series about internet company Seethru. Reece blackmails Yvonne, Jake bids farewell to Murray, and Brandon frets about leaving for America without making amends with Kumari. Contains strong language.
Written by Richard Zajdlic ; Producer Simon Heath ; Director Kenny Glenaan
WEBSITE: www.seethru.co.uk

With Jeremy Paxman. (S)

Then Party Election Broadcast
By the Labour Party. (S)

Highlights of today's first-round action at the Crucible in Sheffield. Introduced by Hazel Irvine.

Presented by Andrew Neil.

Repeats are not indicated
Open University 12.30 Women of Northern Ireland
1.00 Which Body? 52816 1.30 Desertification -a Threat to Peace? -living on the margins of existence
Secondary Schools 2.00 History- Nazi Germany Languages 4.00 Deutsch Plus (parts 13-16)
Working In Engineering 5.00 Health and Safety
Open University 6.00 Angelica Kauffman. RA and the Choice of Painting 89309 6.30 Modern Art -the Colonial Encounter - the role of African art in modernism