I consider our ensuite to be modest in size and it is 1200x3500ish. We have a 1200x900 shower at one end and the space you are suggesting is equivalent to this with the door open (our drying off/towel rail space). Our vanity and toilet are fairly compact so we do have space between them which could be condensed slightly and still work. However, you need to account for elbow space not just the width of the vanity or toilet. I don't think you would fit either vanity or toilet next to shower on the shorter wall. Maybe with a corner/triangle shaped shower? There was a compact bathroom post a while back that had this suggested. I can't recall the exact dimensions though.

some of the dimensions are missing and the size of the bedrooms and family room don't seem to match but will attempt approximated size to try and understand the spaces...what kitchen appliances do you want and how do you plan to use the pantry? first thought is to suggest that the island should be restricted to 3m to avoid joins in the counter and the windows should be decided according to views and climate...windows facing east and west can overheat the whole house so would suggest that the the windows on the eastern side of the dining room could be smaller and depends on what you plan for the side garden but what changes are allowed for the plan?

Thank you so much for your comments and great ideas kiwimills , Pleased to Bijou Design , Leeder Interiors and oklouise . I agree with the door at the end of the bed being a better and more convenient position. Originally I had not included it there to access some of the light from the other window (obscure glass slider), and to avoid the feng shui coffin position with feet facing the door. On further reading I might be able to remedy it with a tall solid bed-end and blanket box/bench. I can see how walking through the WIR each time would be a pain. An alternate ensuite plan (below) as also suggested by Leeder Interiors. I wasn't sure if I had enough room for this... it would get me a larger vanity 1200+ rather than 900. Not sure however what: the recommended distances from the vanity front and toilet should be ? minimum width i need to have for the toilet space (between the wall and slider opening) ? If not, the extra bench space over the cistern also sounds like a good idea. Thank you

Yes you are correct about being mislead by initial drawings. But a 550 x 350 niche in your shower, should be big enough. A average bottle of shampoo only takes up 100mm.