Thanks for all your input and the wonderful diagram! I agree that ideally the bath and loo would be swapped. I need to talk to the plumber about how feasible / expensive that would be if it is prohibitively expensive / difficult I think I'll stick with my idea. I've not come up with any good reason not to have the shower in the centre of the bath rather than the end and I hope this might actually give a bit more room when in the shower rather than being squashed up at one end

This is how the lounge is looking right now. Excuse the mess as we're just clearing out the understairs cupboard to hopefully put in drawers instead for shoes etc! Anyone have any ideas how we can arrange it better please? Thanks for your advice so far Minnie! The understairs bit is tiny and not able to fit much under currently. Not sure how much it would cost to remove the fireplace. It does add a bit of charcater though to a boring 80s box so i'm a bit loathed to remove it? TIA

I haven't had long to look at it, but that is a tricky lounge. A decent size but an awkward shape. What would really help is knowing the measurements of each and every wall in that lounge. Moving walls and doors can be expensive and you should always consult a structural engineer. By moving the doors and walls, even though it makes the room technically smaller, it'll feel more useable. I moved the kitchen door to the corner, which frees up a bit of wall space to hang the TV. You would need to move some kitchen units, so I've put them against the stairs. You could fit more here anyway. I've moved the hallway door in a bit to square the room. I don't suppose you really NEED to do this, but it will make the room a more standard shape and make better use of the hall storage. Either of the layouts I can think of would equally work with the door where it is though. Sorry I haven't got the software or the time to draw the layouts but hopefully you can get the idea. The two layouts that spring to mind are 1) an L-shaped sofa in the window corner, with a single elsewhere (where the measurements were maybe?) You might fit a small desk by the double doors. OR 2) an L-shaped sofa partly under the stairs overhang, with the TV on the long wall opposite where it is in the photos. You could maybe put a single seat beside the double doors, and a desk in the corner near the window. Without moving walls, I'd maybe put an L sofa in the window corner and a single in the corner by the double doors. You might fit a small desk (110mm?) under the stairs. As I said though, if you could measure every wall, that would help get a better understanding of what could go where.

i meant to have the bed over the existing wall and part of the alcove like this, with the blue bit being built to look like a wall, but with access through a simple door... Depending on type of bed headboard you could have recessed shelves built into the storage above and/or beside the bed to act as bedside table.