First things first. And there are 3 tests you will have to pass. You need to go here
FPGEC | National Association of Boards of Pharmacy to learn if your schooling is eligible for transfer to the US, and then what you will need to do to apply for the FPGEE.
First, you will have to take the TOEFL, there are no exceptions, even if you are from a country where your native language is English. Many people say TOEFL is the hardest test to pass, although it will obviously be easier for you since your native language is English.
Most likely your education from England will qualify you to take the FPGEE (the licensing test for foreign pharmacists.) Possibly not if you had graduated years ago when only a Bachelor's was required. This exam is usually the easiest of the 3 exams.
Actually, I think you can take the above tests in any order, but you have to pass them both to be eligible for licensure.
After passing the FPGEE, *then* you will need to contact the state board of Florida or whatever state you want to work in, and take their law exam. This exam is usually tougher than the FPGEE, but easier than the TOEFL.
BUT, your real issue will be getting a work visa. It will probably be easier to become a permanent resident, then to get a work visa. Pretty much nobody sponsors work visa's for pharmacists, and the few that are sponsored, have been sponsored for many years, or are being sponsored in jobs which nobody in the US will touch.
So do not count on getting a work visa, it won't happen. But assuming you do get licensed and become a permanent resident so you can work, then the next hurdle will be getting a job. As mentioned, Florida is a state of high saturation, it will probably take quite some time to find a job, and your first job will probably be part-time.