SORRY non-athletic types, but once again the most exciting viewing on the box is the sport. This morning (Prime Sports, 10.30) the British Lions and the All-Blacks will do battle in the third and final Test of the New Zealand tour, and it promises to be, as an over-excited rugby commentator once remarked, ''a real cliff-biter''. Both teams seemed evenly matched in the first Test, with New Zealand clinching victory in the final moments when Grant Fox kicked a penalty. Last weekend's second Test was an entirely different story, with the Lions roaring to a 20-7 rout. Once more intothe breach . . . FOR nearly two weeks, women's singles tennis at Wimbledon has proved totally soporific - the Graff/Navratilova final appearing a foregone conclusion. That changed on Thursday when 24-year-old Czech Jana Novotna deftly outmanoeuvred nine times champ Navratilova 6-4 6-4. If Novotna plays as well in today's final (World 9.05pm), we might actually have a women's game worth watching. EVEN Pearl's movie alternative doesn't really leave sport alone. It's Kickboxer (9.30pm, ORT 97 mins), an oft-seen, violent little tale which gave an undeserving world Jean-Claude van Damme. CRITICS in America loved John Gay's ambitious adaptation of the Harriet Beecher Stowe classic Uncle Tom's Cabin (World 1pm, ORT 110 mins). Surprisingly, this 1987 TV movie was the first American sound version of the classic. The cast includes Phylicia Rashad (The Cosby Show), Bruce Dern (The 'Burbs) and Edward Woodward superb as Simon Legree. IN 1937 British producer Alexander Korda cast England's handsomest new matinee idol, Laurence Olivier, in The Divorce of Lady X (STAR Plus 2.30pm, ORT 92 mins) opposite Merle Oberon. The resulting comedy, in which Oberon attempts to ensnare divorce lawyer Olivier by pretending to be the wife of a client, is very dated. DREAMS Lost, Dreams Found (Pearl 12.20pm, ORT 102 mins) is a soppy story of romance between widow Kathleen Quinlan and dashing Scottish laird David Robb. As such it should be ignored, but for the real star of the piece - the glorious Scottish Highlands,which are breathtakingly beautiful.