heathrow airport

I'm through Customs and Passports and on my way to my final destination. I've already walked out of the lift when I realize I’ve left my suitcase behind. I turn round to get it but the lift doors have already closed and the lift has gone. I freeze as the emptiness sets in. The lift has gone, my bag in it. I'm bagless and liftless. Where has it gone I wonder? Where have they both gone?