You're essentially talking about building a collection of passenger-carrying barges that can be assembled in a composite unit with a maximum capacity of 200 passengers, right? Or total personnel capacity? Generally, regulations are in terms of passengers carried, not total persons on board, as the number of crewmembers doesn't really impact the classification of the vessel, except in specific areas.
If the modules are self propelled, they're ships, if they carry more than 12 paying passengers they're passengers ships. If they're not self-propelled, they're barges and if they're joined together by a rigid connection, the whole is a composite unit. A flotel would be permanently moored, and a whole different animal.
The barges would be classified as passenger vessels if they're rated for more than 12 passengers. I have never heard of passenger barges, so I don't know if there are specific regulation pertaining to them.
If the barges are used as work barges, and the 200 persons are crew members, then it's a bit different, as you have to meet workplace safety and sanitation regs, on top of union agreement regs, if applicable.
Safety regs would be depending on the trading patterns of the vessel (IE, SOLAS or local regs) Workplace safety / sanitation (IE, the number of toilets) are generally a flag state requirement.
You could probably get more precise info by contacting your local marine safety authority. I'm not sure what the project you're describing is, really, and I'm not familliar with UK regulations.
Think of every barge as a separate unit, that'll make your search easier.
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