I know someone who lives in a house with the same layout as house 2, the more expensive one.
They've said that they find the route from the sitting room to the kitchen to make a cup of tea a bit of a faff, having to go through the dining room. It dictates how they can have their furniture in the dining room laid out as the 'corridor' needs to be kept clear of obstacles.
House 1 could do with a ground floor loo - what is that building in the back garden? There's no mention of it in the details. Assuming it's some sort of shed, I'd be inclined to get it plumbed out and get a toilet fitted, maybe get my washing machine plumbed in there too to free up some kitchen space. You're only needing two bedrooms, so the basement rooms could become a cosy sitting room / cinema room / gym / spare room for visitors. (I have a second sitting room in the basement, it's great!) Being £200k less, I'd feel able to spring for any building work it needed to give me that toilet / cinema room.