We got ours from Costco recently, it was just shy of £70 (IIRC).
It folds down pretty flat (wheels come off and the connector bar fold back under the main unit) and seems just the job for my 5 year old and my 20 month old.
The max weight it can take is about 50kg (from memory) which is about 7.5 stone in old money, and it has harnesses for one/two children.
No idea whether you're a member of Costco though, or if there's one near you... but if you are struggling then I can pick one up for you and if you're in the Manchester area any time soon you could collect it.
Hope this helps.
