If your bathroom size is 3m x 3m you will be able to easily put both, a shower and a bath tub. As to the toilet going on the wall where window is - it all really depends where the stack pipe is. Naturally it will be much easier for the toilet to be as close to the stack, but you can always box the pipe. Running it fully under the floor is not possible due to the size and can only be partial not to weaken the joists too much. I have drafted a quick layout for you with two options A and B. The difference is that option A has a smaller vanity unit, single washbasin and a mirror, while option B has a larger vanity unit, two washbasin and no mirror. Both layouts give you a decent size (1m x 1m) walk-in shower (wetroom) and a good size bath tub (2m x 0.9m). You can really shuffle things around here and for example have a bath tub by the window (upper corner opposite of the door, where toilet is now on the plan) and toilet next to it (pipe can be easily concealed under the tub). Possibly two washbasins with vanity unit and a mirror to the left of the toilet and a shower opposite to it with potential of having a washing machine (where the vanity unit is on option A). Let me know what you think and we can draft some more layouts.

We love the white too! It looks great alongside the white sloped wall and window areas. You've done a great job, well done :)

I love your floor tiles! I think that kind of floor looks best when everything else is calm and white. It lets the floor take centre stage. That’s just my opinion. There is no right or wrong way to finish a room, it all comes down to personal taste. That’s just what I prefer.

Hi You need to check re soil pipe - my opinion is that it is best to keep the WC as close to the soil pipe as possible to avoid unnecessary problems. You may want to opt for a free standing bath which would add glamour to the room - you can find various sizes (see link below just for an idea) https://www.victorianplumbing.co.uk/1650-x-750-luxury-modern-double-ended-curved-freestanding-bath Or Back to wall 1500x750 https://www.victorianplumbing.co.uk/orion-1500-x-750mm-small-back-to-wall-modern-square-bath?campaign=googlebase&gclid=EAIaIQobChMIqIDjyp7Z3gIVVOJ3Ch1BiQfcEAQYBCABEgLdzfD_BwE&gclsrc=aw.ds An Offset bath may allow some more flexiblity in the room as the space is rather tight. See https://www.heatandplumb.com/acatalog/carron-quantum-spacesaver-offset-bath-1700mm-750mm-left-handed-5mm-acrylic-q4-02179?utm_source=google&utm_medium=Shopping&gclid=EAIaIQobChMIwerA-Z_Z3gIVyeR3Ch0ZdQQSEAQYBSABEgKlufD_BwE and https://www.heatandplumb.com/acatalog/cleargreen-ecocurve-shower-bath-1700mm-r16?utm_source=google&utm_medium=Shopping&gclid=EAIaIQobChMI_9fLuKLZ3gIVS1XTCh2H3gcNEAkYDSABEgLGa_D_BwE A Slimline vanity or floating shelf with a narrow but long basin could be an option https://www.victorianplumbing.co.uk/valencia-995mm-black-ash-wall-hung-basin-unit?campaign=googlebase&gclid=EAIaIQobChMIwb6Fn6PZ3gIVWOJ3Ch0mGwqEEAQYAiABEgIJa_D_BwE&gclsrc=aw.ds You have to find a compact wall hung WC to ensure that there's as much room as possible. I have done two sketches - and have specifically kept away from putting the bath under the window due to soil pipe. I have proposed that you open the door outwards or maybe consider changing to a folding door as per images below If you need any further advise my design practice can help you.