Speak to one of the big flight schools here - they are pretty good with conversions. Bristol, Oxford, Etc. Have a look online.
As an aside, as I'm sure you know already, you have picked a really bad time to come to the UK. There a many pilots with your level of experience looking for a job although what it will look like in a year, when you have finished your conversion, is anybody's guess. It will take some time to pick up.
What about joining one of the big operators in the US and moving inside the company - a management position or something. Probably your best bet at the moment. All the big aviation firms in the UK are foreign owned.