After a week off spent organising our copious Laserdisc collection, the Repertory Film Round-up is back to sift through the silver screen classics that London offers the discerning cineaste. Thursday: Hot-foot it to Highgate tonight for the You're Gonna Need A Bigger Boat film quiz, which this time is themed around "Blockbusters" - a subject the Rep Film Round-up confesses to being less than au fait with. Entry is two quid, and it begins......