That's the good bit. It's not impossible. Go for it!
There are some professions that make a work more visa plausible: teaching and medicine are, for example, too very sought-after skills and people would move heaven and earth in some cases.
Insurance/finance, well, you have to prove you have a skill no one else has here (afterall, you can't put exisiting qualified people out of a job). And, as otterpop said, "There are lots of motor insurance companies over here!", which can also be construed as the fact that it isn't an isolated skill here.
Don't give up...I love to see enthusiasm for new adventures. If you have the hope, then that's the first step in making it happen. And the UK (any country) can always use enthusiastic people wanting to be successful.