I think you can definitely do this, provided you can move your door which you said you can. I have an ensuite at the side of my main bedroom - it's small but perfectly adequate. I measured it and including all external walls the ensuite takes up 1.4 x 3.05m space (my bedroom including the ensuite is 4.7m long so shorter than yours.). My room is wider (3.9m) so I can have a wardrobe along the wall where your door is and the bed on the opposite wall. But for you, I'd keep your bed where it is and look at putting your bed in a 'wardrobe wall'. you have the depth (1000mm) before the window starts and I think 3.3 m is wide enough ... ~800mm robe either side of bed. See pics below for what I mean. Only you will know if this is too squeezy but an ensuite can make so much difference to your lifestyle, I think it could be worth it!

I love no.1. The black wall and white floor draws my eye and it skims past all the soft white fittings. It creates a sense of space and flow. It has continuity. In no.2 my eye hits the dark floor then gets distracted by the white loo and two coloured vanity. That's where it stops. No. 3 is my least favourite. In no.3, the white wall is harsh and draws attention from the rest of the bathroom. It gives me a sense of harsh disjointedness.

I am just wondering whether it is a good thing or not to go with solid colours like the dark blue (prussian blue), grey floors and white on other walls all in tiles. I see that a lot of designers seem to do a pattern on one wall, but I haven't found one suitable and whatever I do, I just don't want it to look out of date in 5 years time. I am not sure how about much of the prussian blue tile is appropriate in order for it to be noticeable but not too overpowering.

Yes thank you for your thoughts. the room is 2.8 (with window) vs 3.4m. I do find it a bit annoying too as I don't like that you open the door and see straight away into the shower (though I'm certain the door would have a lock). I'm sure they lined the bath up to be with the window as visually that looks better, but then I find the space at the end annoying. I like the alternative drawings (I like three of them lots!) and I had been considering an drop in bath built wall to wall rather than a freestanding but also finding it frustrating to find a really nice supportive bath and there are less drop in baths than freestanding around at the moment which is a bit annoying. Thanks Anna for the picture, that helps as that looks good (though we would have more space at either end, 50cm) and I prefer the look of yours with some space but not as cavenous... I think I might have to have a talk with my husband as we really need to work out what to do!!