I think the layout is fine, I can't get the floor plan big enough to read the words so if every room is what I think it is it works fine. I think it could be improved by knocking through and rearranging downstairs, but that is my taste. It works fine as it is.
I agree with tricot about the conservatory. I'm a bit
about the windows some white some brown? I think the exterior can be vastly improved but not on the cheap. Well I suppose it is all relative, thats an expensive house so % wise it probably won't be a lot.
I would change the windows, replace the conservatory with a sun room and the odd dormer thing, with slate roof(s) on different levels to make it look more ramshackle cottagey. Perhaps render the house too but If the brickwork is all good and similar bricks then probably leave it as brick.
How does the price stack up for the area? If you want to do works to the house, get a builder to price them and then make the offer less that amount.
I think you could make that a very nice house, but I would be interested to know what else is available around that price. You should be able to get something pretty special for that!