Ok well go for it but without wishing to reiterate the same thing time and time again, wait to do it, there is no point having an IR you can't use and then spend £1200 a year to revalidate it and not use it.
I would recommend a DA42 operator for the IR, it is an awesome plane to fly and allows you to focus on the instrument side of things. Atlantic perhaps. Price is going to be much the same everywhere in the UK, pick soemwhere that can give you good consistency and try and have it put in some form of contract that it'll be assured within reasonable means.