We can help with layout suggestions. But can you post the unflipped plan so we can read dimensions.
Get a builder in to look at where your roof loads are coming down onto walls. Moving bedroom walls may be an option. Short spans aren’t too expensive to address

Homestyler is a free online software that's easy to use

My thoughts as well @Kate. Close up the bathroom bedroom door, it is not necessary and would then give room for a toilet.

Thanks guys.
Unflipped plan attached.
There is no door to the bedroom at some point someone has already closed it. We have small children so want to keep a bath. Will be taking linen cupboard space too (first wall on left) which not even in the drawing. Pic attached

We've had someone out. Apparently most walls are structural as have beams up holding roof everywhere :(

Okay the photos are better idea of the bathroom, as the original layout is no longer there. So what is the actual size of the bathroom with linen cupboard removed? As the linen cupboard is not shown on plans either?

Is the bathroom space with linen cupboard still 3200mm x 2000mm?

Actual sizes including taking the space for the linen cupboard is 3140 x 1800 (that measuring tiled wall to tiled wall for width and to doorframe for length).

Attached is what I'm *hoping* can all fit in .. in a wet room style and changing door to cavity slider

if the bathroom dimensions don't match the plans could you please confirm dimensions of all the other rooms including all the bedrooms, laundry, hall, living and combined kitchen family room