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"When it comes to resale not everybody likes double showers, but everybody likes extra storage." Double showers look luxurious in display homes but it's not a feature I have ever thought yes, how useful, I want that. In fact I always wonder, when someone uses the washbasin while I am showering the water temperature fluctuates so when using double showers do you need to coordinate turning them on and off to avoid someone get a blast of hot or cold? I definitely like extra storage.

if you don't need space for a table or barbq available area will depend on the depth of the doors when open but allowing about 90cm around the perimeter of the alfresco leaves a floor area of 4.2m long and at least 2.1 m wide

Thank you Kate for that suggestion. And thank you, Jan Dobson for that very comprehensive and extremely helpful response. I gave your advice a lot of thought - especially the remark about stepping over a wide rim. That makes so much sense, and might partly explain why freestanding tubs have gained popularity. I thought a freestanding tub would not work due to the tight space (I didn't want to create cleaning problems!) but I gave it some further thought after reading your comment. I'm wondering if a rectangular back to wall freestanding tub with hob around three sides might work, eliminating tiling up the front and the rim at the front of the bath completely, but still avoiding the cleaning hassles of a tub with small spaces around it? I love the idea of a rim behind the tub, or a shelf above the tub. And putting the taps at the end does make sense. Maybe something like this? While there are advantages to extending the vanity over the tub, after a lot of thought I decided I'd prefer a smaller vanity and a space between vanity and tub where I can put a small stool and some towel and robe hooks on the wall. It's a guest bathroom, and there's a 900mm vanity in the cloak room next door so I am thinking a large vanity isn't a necessity, but a space between would make cleaning the top end of the bath easier.