I would look at creating a ledge at the end of the shower at the height of the angled ceiling (for shampoo, conditioner, etc), and tiling it to the ceiling. Then you could wall the side by the WC with glass.

You need to get rid of the skirting boards, which is going to be a problem now that you have tiled the walls.

I hope you have a good exhaust fan too, because the window frame will still get damp with steam. To be honest, it would have been better to fill in that window and put a sky light in the ceiling.

I agree with kooky_karen – no skirting boards in wet areas (just asking for trouble!) and I would go for a glass screen rather than a tiled partition wall. The shower base (whether acrylic or tiled) should extend from end to end rather than having tricky little bits left at the edges/ends. Is there any way that you can reshuffle the other bathroom components (vanity, toilet etc) so that the glass screen could go three quarters of the way across the opening leaving an entrance section open (no door)? At the moment you'd have to crab around the toilet but if that could be shifted that would improve matters and leave you with an accessible wall for towel rails etc within reaching distance of the shower. Try rethinking the vanity so that it has a smaller basin, more usable bench space (maybe a wall-hung cupboard beneath for storage etc) ... I would keep shuffling little pieces of paper drawn to scale around the paper plan until you arrive at a better use of the space. I am assuming that the diagram is the view from the doorway but there is no indication of how long the side walls are etc.

Hmmm, tricky! I am just wondering if the shower could go opposite the vanity with the shower rose pointing towards the sloped part/window. And then the toilet moved back on one or other wall near window with a storage cupboard built under the slope opposite the toilet. Can you show us where the door to the bathroom is or give any further information about the room dimensions in 2d. The first pic outlining your layout looks almost square to me but I note you have 2700x1800 to work with.

Hi all thank you for your comments, the bathroom is 2700 wide (window wall) and 1800 deep- looking at 2D plan from doorway, less the boxed in area to the left of the window which is 700 x 800 which creates the fixing wall for the shower head, and and an alcove for the basin area. As you can see it is a planning nightmare and all your suggestions are very useful, I had thought of closing in the window all together & putting in a skylight, but externally it would mess up the appearance of the upstairs windows that are all the same and look nice from the street view.Always a balance between one decision and another.

All other options for placing the shower = claustrophobia and given the room is already so poky, at least a shower floor area of 1370 x 800 will give some sense of space.

Ive read up on so many design ideas for small areas, thank you angelasusanm, I'm shuffling papers all over the place as I love proportion and a bathroom with many angles is difficult, especially for tiles to look good.

This bathroom is not a redo - its never been completed and so there are no skirtings or wall tiles or anything, the pic has a piece of wood looking lino on the floor.

wollemi - with regard to external appearance of upstairs windows. I found this site for timber look windows - http://www.australianwindowsolutions.com.au/timber-look-windows.html

I also agree with angelsusanm - the shower base should fit from end to end.

Thank you all and especially sslorach for your practical advice, esp re mixer and long grate drain. These are such important tips for me (a person aiming to be practical with an aesthetic interest also). :)

...and the shower fixed pane, I am taking on all these ideas as well as kellyjean21's to keep it open.