I do the same as double_barrel. However, back in about '07 there was a security alert in UK which resulted in all possessions going into the hold. I was travelling with just hand-luggage, but that, including car keys and phone, had to go in the hold. We were allowed to retain only wallets and passports. If that bag had been lost (and remember, this was applying to ALL UK departures), I would have ended up at destination without the keys for the car, which was in the park. Also, no phone to call my wife to collect me. Stuff of nightmare. Luckily the bag arrived safely, but it had been a worrying flight.