Basic bathroom cost

[MrsBudget22]

My mother is in her 80s and has fallen whilst trying to get into and out of the bath a couple of times. She also limits the amount of baths she has due to the cost of heating an entire tank of water with an immersion heater.
So I wanted to have her bathroom converted to a walk in shower with grab rails and room for a seat. Her bathroom is tiny.
How much am I likely to be looking at for a very basic remodelling including shower, tiling, electrics?

[MrsBudget22]

Oh and it's Scotland.