I seriously doubt you will be able to do an IR in 2 weeks, you have to wait at least 1 week to get a test booked.
Another factor is the weather in the UK, even if IR and in Sim, you will be stuck purely because UK does not have good enough weather to be able to believe you might get 2 weeks flying every day. Also IR requires some time to reflect on each lesson, so unless you have very much experience already I doubt you will have any chance to make it. Even the conversion will be hard to do in 2 weeks from what I have heard.