Errr... all the entrants had confined spaces, that was the point of the competition, it's just that the others managed to combine their artistic talents with their gardening talents to create a unified space.
To me, the winner's garden was just a hotch-potch mess.
Each to his or her own I suppose.
I couldn't believe this result, her 'garden' was just a collection of random trendy, hipster cra_p, stuck on the walls with a few plants stuffed in between. It was was totally un-coordinated and disjointed. For me there were three better gardens then hers, still, I expect the BBC will drool...