Depends on your hours and the a/c you have been flying. Basically if you don't have 500 turbine multi crew over 19000kg (I think it was) you're outa luck.
I'm just starting a conversion now.
Best person to PM is REDSNAIL, she knows it all. Or even better ring the Brit CAA. I had some luck and got through straight away. Everything I wanted to know was emailed to me.
If you decide on starting give me a yell, it's always hard to find other people here studying the same stuff.
Good luck with your decision..