Finally finished the hall and the transformation is complete. Kept the doors but painted the architrave and all other woodwork (Farrow & Ball Dimity Eggshell). Walls (F & B Joa's White Modern Emulsion) Carpet is sisal. Window shutters California Shutter Co. Wall up/down-lighters John Lewis, as are the ceramic radiator shelf lights, painted to match wall. LED Panel 'skylights' are magical. Wired to an external Dusk 2 Dawn sensor via a relay (To transpose output to Dawn 2 Dusk) they are activated by two occupancy sensors either end of the hallway and only operate during daylight hours, thus giving the very real effect that it's daylight flooding in. The wall lights are for night time and if it only needs to be subdued lighting, then the remote controlled shelf lights are used. The flickering flame wall sconces either side of the old loft door are for amusement at best, but look nice. Now to find some suitable wall decoration and also fit a curtain and tie-back at the mid-point. That will allow guests who use the end bedrooms some night time privacy when using the bathroom down there. Thanks to all you Houzzers for your input and support!

A little better now. Sanded floor in good condition and left quite "raw" but smooth and safe...

Whilst it is commendable to be looking at architectural solutions to your problem. I feel a lot of these issues could be remedied through thoughtful garden design and a complimentary landscape scheme. Whether you are looking from the property itself or from the approach to the property, there are many ways that these views can be framed or softened by the use of specimen trees. I would be interested to see a more comprehensive plan / visual so I could advise you further.

Would this plan work?: Phase 1.  Knock the wall (including the storage cupboard) between the current bedroom and hallway and the convert that space into a living room, with patio doors to your garden? As part of this I'd open up as much as possible, the connection between the new living room and existing kitchen - which remains your kitchen. Again, depending on your budget you could maximise the connection between the kitchen and garden. The door into this space would now be at the top of the current hallway ie at the opposite end to the kitchen.  Ensure you spend money on insulating this new space, before redecorating this space. It's likely that your budget would be gone doing all these works.  Phase 2. Convert the bathroom to a second bedroom. Use the front room as your new bedroom. Move the bathroom into a newly created, linear space between the new bedroom (at the front) and new living room.  Phase 3. Build customised storage and laundry spaces into the height limited basement. Design your kitchen in phase 1, in such a way that the kitchen space vacated when the washing machine moves to the basement, that the kitchen unit can be reused for something else.