Any parent who ferries teenagers* around at night knows the problem: most suburban house numbers are unreadable in the dark — it’s why I carry a LED torch in the car. Which is what makes this solar-powered solution so neat. Thanks to Michael and Laura for the idea (and for a lovely supper). $19.99 per number. From ThinkGeek, naturally. Can’t find a UK supplier, yet.

* “Dad’s Taxi Service”, as James Miller calls it.