I'm torn between 2, 3 and 4 but I'll have to go with the printed Grassington sofa as It's so unique!

Lounge doorway is 81cm wide with door on, and would be 82cm if could take off. Very old fittings that seem to have been painted over many times so getting door off may be an issue. Doorway height is 196cm Hallway width is 77.5cm and height wise no issue in hall - very high ceilings. The hallway width is probably the biggest problem. The only access to lounge is through this hallway door, and the width is only 77.5cm. The Next team were trying to twist it around but the sofa was just too big. They actually ended up accidentally putting a hole in my wall trying to do it!

If you both like to lie on the sofa then definitely go for a corner or a corner-chaise. It may not look as open/spacious, but you've got to strike the balance between looks and how you like to live. If you can't enjoy relaxing on the sofa then it defeats the point as you just won't use it. We had an amazingly comfy corner sofa which we (and our guests) loved but we had to change it to a 3 seater when we moved house and it just wasn't right for our room. I miss it so much and next time we buy a sofa I will absolutely be buying a corner or a corner-chaise. We like to lie on the sofa too and the 3 seater that we have is way too cramped.

Is your chesterfield a dark colour? Either of the second two would lighten the whole look. You could get another plainer chesterfield style in linen to contrast with the leather. Consider slip covers if you chose cream, maybe a pale grey would be more foregiving and match your silvery wallpaper.