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I'd leave it for now, like you said, it's not about to sprout 10ft of growth and fulfils a purpose. I must admit it wouldn't be my first choice to plant but it definitely adds more than it detracts.
It raises a question I've been meaning to posit here - what plants do you guys benefit/suffer from your neighbouring gardens? On our easterly boundary (so no shade issue) we have neighbours cherry tree which I like, and their clematis have climbed over the fence to mingle with our crab apple.
At the far end they’ve let an elder grow which whilst I think brings aphid and pests has the absolute net win of blocking their windows from our kitchen so I’m perfectly happy with it, more so if the slightly sick looking wisteria bullies it.
On the other side we benefit from a decent budlia which flowers superbly but a rather unruly philadelphus which sits squarely on the boundary and covers my garage/garden/waterbutt in all manner of debris. It's the go to place for the birds to hang out though so it has a reprieve... for now!
Those tiles are beautiful and perfect for a smallish space. They are a complete bastard to lay, they have to go onto a glassily smooth concrete base with a flexible adhesive or they'll crack. Forget the already expensive cost per metre of the tiles, it's the prep that costs the real money and the adhesive isn't inexpensive (you'll need twice the manufacturer's claimed coverage).
But, they are gorgeous.