Im sure that you are right about the index linking if you emigrate to certain countries (commonwealth, USA etc) just get advice in your own case when you emigrate to another country.. as I have. When I mentioned EDP I didnt mean the lump sums, I meant the monthly pension payments..
As I said, be aware and get advice, the tax office has different arrangements with different nations. We've earned our pensions, so dont lose out through poor advice.