Depends on the bathroom mate. I price each job individually. I do not use set prices.
Same as this. I did myself a print out so I could take to each job. Tick boxes etc on what is / isn't needed and I have set costs for those. Like electrics etc. Tiling per sq m.
I take a deposit if buying the suite, but a lot of the time I send customer in to pay for it as it keeps my turnover down and under VAT.