The decor isn't to my taste but it looks to be in reasonable condition. I don't know the area so I don't know whether the price is reasonable or what else you get for that.
The dark games room is the garage, by the looks of things and wouldn't be my choice. I'm not keen on the long narrow and dark kitchen and family room, especially when they've been darkened by that pokey, ugly conservatory. The UPVC isn't to my taste, especially the chunky frames and faux stained glass. It needs a bit of money spending on it to fix the layout.
I do like the fact that it's end of terrace though. I wonder if any windows could be put in the detached side to brighten up the dark rooms? Or just take the conservatory down completely and knock the two back rooms through to give one open, fresh kitchen/family room with bifolds or French doors onto the garden.