Problem solved! I came across the Dog-G8 whilst searching for a stair gate to fit our front door. I read all the great reviews, phoned the company and spoke to a very friendly gentleman named Chris, who answered all my queries and explained how to fit the gate, providing details on the photos I emailed of the door.
I was a little concerned, as neither my husband or I are great at DIY but the gate took literally 5 minutes to fit! Also, the stick on pads seem to be strong enough to hold in place. We have kept the screws but would rather not use on our lovely wooden door. Lemmy our wheaten terrier can no longer escape!