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The first thing that comes to mind is my computer mouse. Shelled out a bit more than I usually would for a more fancy mouse with multiple buttons and it has lasted 10+ years. The middle mouse button died pretty early but I just remapped that to another button close by and it feels awkward and wrong pressing the scroll wheel on any other mouse now. Although it is finally coming to the end of its days now and doing random disconnects and shit.

Also, just in general, shoes are pretty much always worth forking out a bit more cash for. Especially as someone that does a lot of walking, if you buy cheap shoes, you're going to be buying another pair every 6 months.

Other than that, haven't made a purchase that's good for the soul in a while. And I'm envious of your £200 picture lol. It really sounds like you're taking a lot of steps to make yourself happy, however big or small and that's awesome. Hopefully in about a year from now, I'll be able to answer this same question with some cool shit.