the showers them selfs dont need to be thermostatic but you can but an in line mixer that redices the temp for public use the temp should not be ajustable and should not go above a set temp (not sure what the temp is but i will look in to it).
Part 2
Liability is also an issue in commercial premises such as offices, hairdressing salons,leisure centres,hotels and public toilets and washrooms.Businesses can face prosecution if they do not implement protective measures against scalding.
Useful guidance for safe hot water temperatures is provided by the NHS Estates Health Guidance Note,which recommends hot water temperatures of 41°C for washbasins and showers.These temperatures are recommended for all healthcare premises and those registered under the Registered Homes Act 1984(Ref 3),but are applicable for other types of occupied building,including commercial premises.
LINK
http://www.iphe.org.uk/databyte/dom_...lding_TMVs.pdf
hope this helps uug