As Jonathan says, you start with the Soil pipe, and if you've agreed with your bathroom fitter that he's able to put the pipe across the wall behind the toilet and under the bath to get to the outside wall, then that's fine, but if not, you really need to discuss it with a professional. There are many reasons and regulations that you need to stick to with regards placement of soil pipes, because sometimes you need access to unblock them. When designing a bathroom, it is important to know where you have to have some items and then decide where you can put the other items that you want. Check the soil pipe situation as this dictates where everything else can go. I suspect unfortunately, that if you can't solve the soil pipe problem and the toilet needs to go on the outside wall ( which is the normal place for it ), then you may have to have a re-think and possibly change what you have purchased. I've tried to have a re-jig with what you've purchased and moving the toilet to it's normal position, but i can only make them fit if you do what Jonathan suggests. Even then, I would suggest that the door be moved along the wall to accommodate the tall unit. You will have pipework from the vanity that you need to box in, it can go under the bath, but at least it's just water not the soil pipe. I would have also considered a bath to fill the whole gap of 2000mm not a 1700mm, but you can use the gap to build a space at the end both covering the pipes and giving you somewhere to stand toiletries. The taps for the bath aren't marked, so i'd probably put them on the bottom end nearest the vanity on the flipped plan below.

My bathroom is almost identical except for being only the length of the bath plus a couple of inches. I also have an outer cupboard in the same place. Rinq is right to utilise the cupboard for the bath. Mine has the electric meter in it so I can't. Your electric line for a socket can be used for a power shower/water pump. Moving the door to the left and as far onto the landing as possible without having to move the bedroom doors will maximise space for minimum effort. Separate the end of the bath from the toilet with a cupboard the size of a low bookcase. A door on the end will hide toilet rolls and cleaning gear. A blocked shelf at the top will take toiletries for the bath with nice plant above. No view of toilet from bath but with daylight. Shower over enclosed end will contain water spray if the bath slope allows for standing there. I've found a shower curtain works better than a screen. A sturdy laundry bin you can sit on is really helpful in confined space.

Hi Ellie, you have made a good decision on removing the wall. Your new bathroom will look much more spacious. We agree with you on creating a wet room in the right hand corner. It is much easier to install a concealed wetroom shower tray in the first floor, because in older family houses, the floor construction is usually wooden. The problem would be to fit a concealed shower tray into the concrete ground floor construction. So the installation in your case shouldn’t be a problem. We advise you to opt for bigger tiles, so that there is less grouting and therefore less likely for water leaking through over time. Please let us know if you would need help with your bathroom renovation. We can provide you with free personalised design and a professional survey. And supply of sanitary ware and tiles complete with installation.

Both Hansgrohe and (Friedrich) Grohe are German companies; Friedrich was a son of Hans who went on his own in the 1930s, so they share a certain heritage. These days, Grohe is larger and no longer family owned. Both produce outside Germany as well as on their original German sites still. Both produce "basic" and "high-end" ranges. They're both regarded well back home in Germany, much of the choice is down to personal preference. Hansgrohe is on average slightly more expensive (but not on everything). They also own the Axor design brand which has a more "ecletic" selection. One can mix-and-match; in our bath (bit messy, sorry - we're using it for the washing up while waiting for the kitchen to be installed), the mixer is Grohe as is the shower wall outlet, the shower rail and head shower arm (just above the shower screen) are Hansgrohe pieces. At least the chromed finishes are very close for the two: Both can be sourced well below retail list prices - if you're prepared to wait, German online sellers for bathroom goods tend to have many-months delivery timelines. For Grohe essentials (the classical Grotherm mixers) at least, any German DIY shop stocks these at very attractive prices (the difference to the UK retail price list will pay for the ferry ticket and fuel).