There's always at least one batch of revellers who arrive at your door full of good cheer but completely unexpected. Ho ho ho, you say, won't you come in, have a drink and, 'em, something to eat? There's only one thing for it and we recommend them every year: a box or several of Della O'Clery's elegant, up-to-theminute, snazzy canapes, stored in the freezer and ready to pop into the oven. Deliveries and details from Della O'Clery at Blue Ribbon Catering (Tel: 01-2855113).