If you haven’t already done so you must take specialist tax advice (not available from The Pensions Office) to guide you past potential tax pitfalls as regards residence, domicile, income and capital gains tax and many other issues.
As regards pension arrangements in the UK it is preferable to start your enquiries as soon as possible. It may be possible, for example, to make last minute lump sum payments to an existing pension scheme or to top up your entitlement to state benefits.
In any event the sooner you decide the future for your pension benefits after emigrating the greater the opportunity for a specialist pensions adviser to add value to this valuable asset. Who can you turn to?