Are you saying the glass splashback is the wrong size because it doesn’t go all the way up to the extractor fan? If so I’d guess that they’ve installed a standard size as opposed to a purpose made size. If so l would just take that one down and get a taller one made. You could always have the splashback all the way across the wall. l don’t think it needs tiles too. You could add a tint of colour with the emulsion,

Hi Adrian, thanks for the details - love the Caraz! Absolutely on trend colour, and a nice calm, sophisticated palette. Always amazes me just how much influence ambient light has, as the pictures show both to be even warmer in reality. With that info, I think I'd still be opting for white/off-white close to your worktop colour - on, if suitable, using the worktop material as a splashback, but you'd need to check with the manufacturer on suitability close to gas flame. Not all would be permissible. An alternative would be to go with whatever you have picked as flooring tile, if available in large enough size, then cut & edge to suit. Now that large format tiles are becoming so popular, we're finding clients opting for this more frequently, to add a bit more texture compared to flat, plain glass.

They’re fine to use otherwise they wouldn’t be manufactured. However glass is a better material. It will need templating and is more expensive than laminate but is easier to clean. You can choose a BS or RAL number to have the glass sprayed to, but if you leave it clear the colour of the emulsion on the walls will show through so you don’t have to worry in future about respraying it.

Just something to consider. This is only a digital render but try to consider the colour and warmth or coolness of the upper cupboards against the colour and warmth or coolness of the worktop. If one reads a warmer than the other and they are equal in terms of lightness then they might clash. Cool worktops and off white warm tiles or cupboards are tricky. Additionally, any under counter lighting - get the best you can, with the highest CRI rating. LEDs vary greatly in light quality and temperature.