We've just renovated and have 3 bathrooms. no baths. Large walk in showers. We did, however, do the plumbing for a bath in the largest bathroom in case we ever sell it. We don't take baths, so no need to be cleaning the dust off it constantly.

it's time for this bath to be retired back to the paddock...post a plan of the bathroom including measurements, size and location of doors and windows to invite suggestions for an upgrade

Is this your only bathroom? if so consider carefully before you ditch the bath. Families with v;ery young children need a bath and personally for me having a bath is a must, especially on a cold night or after a long day at work. Baths are also still considered luxury items, top hotels always have a bath in their bathrooms. Perhaps you could combine the bath and shower, remember that bath / shower combinations are not always tacky and come in many other shapes, sizes and options now - a semi or completely sunken bath with shower can look stunning, spacious and you can still retain the bath! Houzz already has a great article on sunken baths and you can see in most images they are combined with a shower https://www.houzz.com.au/magazine/sunken-baths-for-every-bathroom-even-small-ones-stsetivw-vs~119731864

Kate's idea of using the pantry space is an excellent suggestion as a toilet can comfortable fit within 800 x 800 alcove with the end opening towards the bathroom and closing the extra door from the laundry toilet could allow enough space to squeeze in an extra handbasin but please double check all the dimensions ..measured from wall to wall the bathroom has to be more than 1200 x 2, the laundry more than 1200 x 2 and the toilet size isn't right or there wouldn't be enough space to open any of the doors??