Glass would look good - give you a little reflectance without mirroring everything on the worktop. Also could be a subtle way to introduce some colour. If you use clear glass with screw back type fixings, then you can change the colour now and then by painting the wall behind if you're nervous about colour, or think you would want to change the look now and then. Another option is a stainless steel, which again would add in a little light reflecting but in a grey tone that would work well with what you have.

Saw an article on Apartment Therapy talking about mirrored splashbacks recently. Had some lovely photos featured, I personally preferred the options where the glass is raised up from the hob slightly. Could you maybe get a piece of the upstand cut to fill the gap? Also having it 'framed' by wall either side looks better to me than it spanning the whole space. I've mocked it up to extractor fan level and to ceiling level (I've guesstimated the tile scale but hope it gives you the idea). Personally I prefer the latter in this space as the proportions look better. http://www.apartmenttherapy.com/mirror-backsplash-ideas-that-arent-from-the-70s-or-80s-248551

Ha ha! Of course. I attach the plan. I spent a LOT of time thinking about the layout - you’ll see that some Houzzers helped me from my previous posts! Happy to answer any questions about the final logic. The cabinets are from unitsonline.co.uk, Barnes, from the Burbidge range, in soft grey and pale navy. DH installed them. Worktops are unistone Bianco Misterio, from Mayflower Stone. Appliances are all Smeg, with the exception of the wine fridge, which is mQuvee.

Hi - bit late to the party - sorry ! But just popping on to say you don’t seem to have any decor end panels anywhere?! You’ll need those on this range as the fascia is longer than the cabinets, so looks odd without them . Most regulars on Houzz forum will know what I’m about to say next - please be careful with seating behind a hob - hot slashes can cause burns.