No
There is no need to retain your offshore assets inside an offshore structure.
Am I deemed domicile for IHT purposes (i.e. have I been UK resident for 17 of the last 20 years?
Yes
Yes
Clean Capital is capable of being contributed to a Trust, Bond or Annuity and should give rise to a tax-free return of capital into the UK.
Yes
Mixed funds should be separated from clean capital though remain capable of being held in a Trust, Bond or Annuity but all monies coming out will be subject to tax if monies going in contained income and/or gains.
Within my offshore assets (whether clean capital or mixed funds), do I have cash or non-highly personalised investments?
Yes
Do I need access to my funds as a pension?
Yes