What business coule me and my wife start in a marina to interest boat owners.

[snooks]

You'd be competing with RS Divers (who ain't cheap) but who do have all the licences, the agreements with marinas and who run a legit H&S operation (two divers in the water, and a third hand in the RIB).

http://rsdivers.co.uk/sail-and-power/services/

Still no sign of life from the OP!

And Sealift....I'm not saying divers don't do a good job, but I like to see the evidence with my own eyes

 

[bikerbill]

My boys in their teenage years made useful pocket money hull cleaning in water. justmask and snorkel rag and scraper. Most people were good payers knowing it was cheap so wanting repeat cleaning like once per month. But I am not sure they would do it for any money in UK waters. olewill

They would not be allowed to do it these days unless they now have a minimum of an HSE part 3 certificate. In a marina I used to berth my dive boat, we used to get people asking if we could clean / inspect their hulls, which we would do. Most people paid up right away, but we had to chase up some owners of the floating gin palaces.