I don't like the photos. If there was lots of choice I'd probably not bother with this one because it's just uninspiring. EA photos normally make houses look bigger, brighter, cleaner and lovelier than IRL, so when you see bad photos, you tend to think it's going to be really bad IRL, rather than just that the photos are poor. I know wide angle photos are a bit deceitful, but when every EA uses them it starts to look odd to see photos without that distortion, so these make it look smaller than the measurements, and also a bit dark. The aerial photos don't really add anything, and where are the bathrooms? If something is not photographed I assume it's going to be ugly and in need of expensive work.
I think if you were going to make changes to sell it, it could do with freshening up and neutralising a bit - too many dark pictures on the walls, clutter on the mantelpiece, that orange wall in the utility room, shiny patterned ceiling with old light fittings. Sorry to criticise your taste, but I think people often just see the house as it is and don't imagine it with their own stuff or painted differently.
It would look more welcoming with some greenery out front - a nice shrub in a pot under the window next to the front door, or a trough of plants under the main window, and the circle thing in the garden looks odd without something on it - bench or table and chairs.
If the 'garden office' is really an office it needs a photo, or people will assume it's just a shed. It might be somewhere that could be turned into a playroom or gym or den for older children, but people can't imagine those spaces if they aren't photographed.
I don't know about prices in that area, but I'd assume I'd be spending quite a lot on this - redecorating, possibly plastering, new fitted wardrobes, kitchen, light fittings, possibly replacing the invisible bathrooms and I'd also want to add another shower in a house that size. So I'd be thinking it's worth at least £40k less than a house the same size that didn't need any of those things.