Ken Loach is the least egotistical of cinema directors. But the Jury Prize award for his film The Angels' Share at Cannes – where six years ago he won the Palme d'Or for The Wind That Shakes the Barley – is something to shout about. It's not just that the film, about a group of unemployed Glaswegians who discover a taste for malt whisky, has that particular but universal touching humour that marks some of Mr Loach's best work – think Kes, think Sweet Sixteen, think that other underrated Loach Glasgow movie Ae Fond Kiss. It's also that, with so many young people on the developed world's scrapheaps, Mr Loach has unerringly chosen a theme which is both entertaining and serious. "Another world is possible," Mr Loach told the Cannes audience this week. Not everyone will always agree with Mr Loach's own politics, but the possibility of a better world is integral to the morality of art, nowhere more so than with Ken Loach.