@ILS27LEFT
It's my belief that many aircraft spend a lot of time parked on airfields in places a lot warmer than Heathrow in even the balmiest of British summers.
It's also my suspicion that laptops or mobile phones have probably been left on aircraft before.
So while that may indeed be the explanation, one can't help thinking that either we have been extraordinarily lucky to date, or the Dreamliner is extraordinarily unlucky.