Is there any British Insurance companys that will insure my home in Florida, 34652, USA?
Owned outright - No morgage. Fire + theft + Public Liability coverage only?

It will be very hard for you to find a UK based insurer to cover a holiday home in the USA.

Hiscox insurance have stated they may be adding USA to thier holiday home cover but not for at least a couple of months.

Most insurers will cover major European destinations & Dubai + some others- but none that i know of in the states.

Anyway with the pound being in such a strong position againsty the dollar - you will probably get a real bargain insuring it in the states anyway,.