This caught my eye as I've bought an ex display Schwinn from here before. I Googled the product you bought and it does say it must be collected... If I were you I'd just pay the difference to get a new one delivered, or just ask for a refund...
Bowflex Results Series BXT326 Folding Treadmill - Gloucester Ex-Display Model
WWW.FITNESS-SUPERSTORE.CO.UK
Ex-Display Model. Customer to collect from our Gloucester Showroom (By Pre-Arranged Appointment Only).