Marine insurance in the UK is sold three ways, and the difference matters. A specialist marine broker shops your risk around several underwriters and argues your corner at claim time. A managing general agent or scheme underwrites within a delegated authority, which usually means faster quotes but a fixed appetite. A direct insurer or comparison-style provider is cheapest to buy and thinnest on advice. All three are regulated by the FCA, and you can check any of them on the register in under a minute.
What you are buying is a set of decisions, not a price. Agreed value or market value at the time of loss. New-for-old on tenders, outboards and electronics, or depreciation. A third-party liability limit (£3m is common, though many UK marinas and European canal authorities now demand £5m or more). A cruising range, from UK coastal waters out to Biscay, the Baltic or the Med, with a lay-up period and often a named-storm or hurricane-season exclusion. Then the conditions that quietly decide claims: survey requirements on older hulls, rigging age, mooring and winter-storage terms, and single-handed or crewed passage restrictions.
The companies listed on this page place, underwrite or administer that cover. Talk to more than one, and give each identical information about the boat and how you use her, or the quotes are not comparable.