I have a similar sized ensuite in my own house and would definitely not put two doors in it. You will probably find that a fixed glass panel to half the width and a glass door the other half would work fine. Alternatively you can get a sliding glass door (again 50/50) if you like the look of them as they do save on space.

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My line of thought is remove; shower tray, shower panel/door, make bath frame, add drop in bath, jib/tile around bath frame. can the existing drain be used for the plug and can we just add a tap for th bath? Would just have a shower curtain. Just looking for the simplest way to add a bath to the existing shower set up. Exceptional drawing below: Measurements from left to right: 1780mm width of existing shower: 870mm

I have to ask, do you really need that bath when you have such a tight space? Unless you have tiny children (and remember that's a temporary situation!,) I suggest a larger walk in shower e.g. 1200 x 800 and heated towel rail on the wall nearer the window so its more convenient. Would definitely keep the double vanity for those busy mornings with storage under and you could add mirror fronted cabinet recessed into the wall above the basins to add more storage. Hope that helps!