I have a shower over bath combo' which its plastic resin something? It's a old bungalow and pitifully small. The amount of times I have nearly slipped over getting out, or lost my balance with soap in my eyes/ or after having a glass of wine. hate hate it. I did see a shower room with a additional hand held device and a over head shower. I thought that good for the odd squirt your feet down. The next owners will probably rip it all out and start again any way when design ideas change.

I've had a think too (thanks to your thoughts @caitlinfurby). Would it work if the bath went down the end beneath the window (handbasin/end of bath currently there). The toilet stays where it is but the wall reduced to a pony wall. The linen cupboard on the right hand side as you enter the bathroom is removed, as is my sons bedroom wardrobe (a new wardrobe for his room can go on the wall in his room against the hallway). That new space is turned into a walk in shower. The cupboard on the left hand side can be widened a bit at that current entrance way to make a new linen cupboard. Around the corner from that, opposite the toilet could be where the handbasin goes or in between the bath and shower? The door can be a pocket/cavity door or just a barn style door to enter the bathroom off the hallway. The current door to the kitchen is actually hinged the other than the plans show but we could just re hinge it the same as the plans show. The first little box area on the plans to the right as you enter the kitchen will have to stay as that is where the fridge is. The window at the end of the bathroom is close to going all the length of the wall...don't really want window sill getting wet from shower hence why maybe bath could go there. Husband wants to have a separate bath and shower. Do you think these ideas could work? Means the plumbing can pretty much stay as where it is too. What to you think??

the last option with shower and toilet either side of the window and hinged entry door opening towards the laundry cabinet... hinged door is cheaper and offers more privacy and solid core hinged doors will improve sound reduction and the back of a door can support extra towel rack and/or clothes hooks and the tall window needs only be same as top of door height (about 2.1m) and if necessary simple hinged doors on the laundry nook will use the least space and are only open occasionally

there should be more separation between the bathrooms and kitchen/dining/living rooms so i would have the door opening off the entry with the front door opening against the bathroom door for more privacy and hinged doors that offer some privacy when partially open, can have an extra towel rack and/or clothes hook on the back of the door and invest in solid core doors that will be quieter and seal better against moisture and odours than slider doors..and the bathroom arrangement is too cramped as there should be about 800mm width for the toilet, at least 750mm preferably 900 width for a vanity leaving about 1200 width for the shower and wall space for towel racks and toilet roll holder with limited space a stacking glass door will use less floor space and be cheaper and easier to screen than bifolds and moving the study door will make the view from the front door walls for artwork and much better than looking into the study or bathroom