This is apparently about the size of your shoe, and you just throw it down on the ground and hop on board, and the brake engages when you step off.
I so want to try one out.
My kids keep banging on about these so I plan on snaffling a couple as Christmas presents. Hope the kids aren't reading this... if you are, then obviously they're for your cousins and not for you!
There are no reviews of these on the House of Fraser website so I can't tell you much more about them, but at this price it's worth snapping one up. Heck, you can always stash it in the emergency present drawer if it doesn't turn out to be of use to your own little darlings!
Buy and collect next day is free, but delivery will set you back £3 for orders under £50.
With thanks to uglybeautyqueen @HUKD