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I would replace the dark worktop for a white one, if you need a refreshing look as no light bounces on dark worktops, hence why yours looks so cramped. then you add a white splashback too, subway white tiles are the cheapest of tiles and glossy ones bounce off the light great, which creates a more airy kitchen.. If you go for mirror splashback, unless you have OCD and enjoy cleaning 3 times a day, then forget it. it will always look smudged.

Hi! Not keen on metro tiles to be honest although the narrower vertical ones aren't as bad 🙈 Just thought of a nice shaped one but struggling to know what colour works with a marble worktop 😂

Yes, you're correct, if you have your splashback up against the extractor then you'll trap the back of the hood facia, which you need to be removable for access to the grease and carbon [if fitted] filters. TBH the worktop guys would just template up to the extractor, they're not kitchen fitters and they're doing what they've been asked to do. Not having an extractor where you previously had an extractor, as a rule of thumb, shouldn't be done under part F of regs, for good design practice you don't make the extraction worse and if Howdens have designed and supplied this then its not suitable. If you've outsourced the quartz could be a bit different though. Howdens do have deeper wall units at 390mm.