I am in a different country to you. But I will try and perhaps use the same logic.
When investing post retirement funds some of the investment choices should be influenced by the following.
tax implication of the investment – meaning what is your tax liability when using the funds, does it incur estate duty? does it incur tax at your marginal rate? is it in line to receive tax exemptions (both on dividend and age of person). Also is it subject to capital gains tax.
Another factor is your time frame plus other investments you have. For example carry out an assets and liabiliy check, any debt in your “estate”. Can a property be sold in order to carry forward to retirement income? (liquidised to provide income). If you have debt get rid of it.. Remember return is less inflation in current terms, plus negative interest. (minus tax, and the others I have mentioned).
You spoke of preserving income, so you need to ascertain which type of income you require from this fund at the end of the term. This will influence asset choice. Perhaps ask a broker to sit with you and do a cash flow analysis. Of conservative moving to moderate and then finally spare cash going to more aggressive funds. (This is more in the income phase). There are technology funds that allow clients to use both aggressive funds but have guaranteed cash floors. So you can enjoy high upswings.
Finally when you retire you have a choice of a linked investment or a fixed interest investment. Which a broker will explain.
Ideally money should be split into risk ranges suitable for time, and objective then your risk profile and fund choice will become clearer.
Have a financial needs analysis done by a reputable Financial Adviser and do ask for qualifications.