Thank you all so much for your prompt responses.
Brooklyn1, YES THAT'S THE ONE.... I followed your link and found it
under Fold-A-Tools, then clicked on Fold-A-Cart. I received an email
back from them and found they have a dealer in UK, but is just setting
up. They will email me when they have all contact details.
The great thing about having two wheels was - my friend had two bales
of hay & some tack in the cart, and her horse on the other side. She
pulled the cart and lead the horse to the stables at the same time.
Nothing tipped out as it was balanced.
Thanks again to all of you taking the trouble to help out! Much