There was a van outside this morning. The man getting out of it was carrying a multimeter and other electricians’ tools. On the side of the van was a lightning symbol and the word BlueFlash, which seemed to me to be a particularly inappropriate name for a firm of electricians, rather like calling your gas-fitting company BigBang. A closer look at the van showed me I’d got it wrong. The firm fits burglar alarms. A bit of lateral thinking would have told me that. Perhaps all this snow and cold weather numbs the mind.