The worst thing about going on holiday is, well, the going – traffic jams, suitcase slaloms, queues, more queues, other people. What if you could get that shoulder-loosening Smith-hotel feeling as soon as you left home? We tried Heathrow‘s star treatment… Let’s face it, until you do that victory face-plant onto your hotel bed, your holiday hasn’t begun. If you’re anything like me, the build-up usually involves playing Tube Tetris with your luggage, enacting full-body pat-downs every half …