Valentine's Day kind of creeps up on you, doesn't it? Yes, we've seen you rushing around Asda, gaping in despair at the empty prosecco shelf, the depleted card racks and the debris that used to be the cut flower display. You can almost smell the panic in the air. Want to avoid that? The secret is to get organised early rather than at the last minute. Not much of a secret, really. Kind of obvious, in fact.