I can recommend the HMRC website that tells you all about double taxation agreements and residency rules. For example, on the HMRC site, DT 1927 states that UK government pensions paid to non-UK residents are taxable in UK (hence my earlier comment). However, if you delve into the detail, it would appear that UK Govt pensions paid to residents of Australia, Canada, New Zealand and Cyprus are exceptions to the general rule and can receive UK pensions tax free. The bottom line is that you need to check the double taxation agreement for the country of your new residency.