One thing I found out today is that if you retire to the Philippines it has a double taxation treaty (just like many other countries) with the UK so you don't pay tax in the UK and only in the Philippines.
What's particularly handy about this is that in the Philippines all retirement income is tax exempt so you can withdraw as much as you want from your UK SIPP and that won't incur tax charges either in the UK (as due to double taxation treaty you'd have a Nil Tax code applied) NOR the Philippines as pensions are non-taxable income. Same with state pension. You'd have to remit to a Philippines bank account though or to an expat bank account such as HSBC etc.