Taking out a partial annuity

I have had a total mindblank and can't seem to get a clear answer from anywhere;
If someone has a fully uncrystallised pension pot and they want to use £150,000 of the pot to take a partial enhanced annuity then;
1. Does tax free cash have to be taken first (therefore using £200,000 of the pension pot, £50,000 TFC and £150,000 to buy annuity)
2. They pay in £5,000 a month to their existing pension, is the MPAA triggered for partially annuitising?
3. Does a spousal benefit cover a partner (they are not married)
4. If guarantee built into pension and client died within guarantee period would the benefit be paid to the partner (not married) or children from previous marriage?
Thanks!
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