Robert Zemeckis’s distinctive-looking animation, digitally derived from live-action footage, gets a re-release in 3D (though it’s been shown in the format before) for its 10th anniversary. A small boy, heretically doubting Santa’s existence on Christmas Eve, is carried away on a locomotive to the North Pole to meet the great man himself. For half an hour or so, it’s great stuff: a mixture of Spielberg, Norman Rockwell and Roald Dahl. Then the schmaltz content gets higher and higher, as if administered through a drip feed, until by the end we are drowning in sucrose.