While on a hunt for a safety gate small enough to fit our doorway I found this at John Lewis online. Bargain for £7.95.
I have seen it on here but it was a while ago and has since expired, it is in stock again so be quick if its what you're after.
This all purpose safety gate extends from W61 - 102.7cm to fit almost any door or staircase. It opens in either direction and fits securely to the wall with the brackets provuded. It's self-adjusting so you won't need any extensions.