Law / Getting Divorced with a Polish National [8]

Hi There,
Unfortunately after being married for 4 years and together for 9 years my marriage have gone bad and I want to get divorced. Its very sad and it looks like it will be a bad divorce. I wanted to hear if anyone of you have any advice. I speak English, Swedish and Polish.

Here is my problem
We live in the UK
We got married in Thailand (civil)
We did a church wedding in Poland
I'm a Swedish National
She is a Polish National
I'm working but she is not

She is threatening me that she will take me to the cleaners and will be asking for spouse support for a very long time. Of course I don't think that is fair as we are both at fault.

I wanted to hear if anyone has any advice on how to best to do this and what country will be able to be most fair to me. I don't feel bad about asking as I know that she has been doing the same and of course I want to protect myself the best way that I can.

Any advice or suggestions would be hugely appreciated.
Many Thanks
UnhappyDan