Unfortunately, the picture is showing very narrow area so it is hard to decide what would be the best choice. I am afraid the small piece of glass splashback, especially if sits on the Silestone upstand and is very close to large door may look unbalanced. The solution could be bespoke splashback all the way between wall units and upstand. In such case, you could bring some colour to the kitchen to optimize the look of it, perhaps very light yellow. If you think the short piece will work then maybe clear glass with some crystals pattern, not too busy but creating a statement.

Heyyyyy so, I’m not sure whether anyone will see this but just wanted to say thanks for all your thoughts and advice. I ordered the windows in Feb and they’ve been done today- thought I’d share the results! I went for anthracite flush casement with a Georgian bar- absolutely love them! We also redid the tarmac drive and added in a planted bit at the front with olive, lavender, bay and box, painted the slate grey render white, painted the UPVC door with Frenchic paint in Cool Beans, new lantern etc. Interested to hear any other suggestions if people have them. I think it’s made a real difference to the style of the house, and we did a lot of it ourselves reasonably easily.

We recently replaced ours after lots of back and throwing with designs. we wanted grey but decided against due to contemplating with how long they'll "stay fahsionable". In the end we went with white & decided to not have the diamond lead this time wheich we thing made them look more modern and lighter inside. We used a really useful website www.windowsplusonline.co.uk where we were able to design them ourselves to suit what we wanted. They do offer a range of colours and designs and as someone said above grey exterior and white interior also seemed a really good idea. Sorry would upload pictures but computer isn't letting more for some reason.

Personally I think the brickwork and gutters need attention first. I also think the driveway goes too close to the house and wide boarders would give you the opportunity of softening the house with planting. Separately I think the red brick porch matches the chimney and above one window so I don’t have a problem with the brick- I suspect you feel it has less presence than the rest of the house but that is likely to do with its proportions and because it’s on the side of the house with fewer windows. Your approach depends on whether this is the main entrance now. Personally I would make the big old door on the front the principal entrance, I would signpost it with a proper path, planting and big lights each side of the door or a lantern above and smart paintwork to the door. I would then obscure the small side porch with planting and since you don’t like the red brick you could clad it with oak or paint it dark green or black to make it disappear. If the red brick porch has to be your main entrance then you need a wide path, sentry like planting to direct visitors to this door, great lighting to find it in the dark, and then I would add window frames and door frames to make this humble addition grander. As far as window colour for the main house…… in my opinion although stone colours or brown/greys might compliment the stone this approach is successful on houses with big grand windows where yours are narrow- in fact when you see this shape window it is often much bigger on old schoolhouses or church’s. Since your windows are one of the best architectural features of the house I think it would be a pity to make them disappear- for this reason I like white with a bold colour for the front door. Or you could choose a cottage colour such as a pretty blue. But since you have taken a contemporary approach for everything else consider painting the windows in a loud brash colour such as a burnt orange, egg yolk yellow or peacock blue in order to celebrate them and help increase their perceived size versus the stonework.