How it helped
The advice therefore was to take her tax-free cash (c.£25,000) and invest it in an ISA over 2 tax years), then withdraw £10,700 per annum of the balance £75,000 to keep her within her personal allowance.
She would then have well in excess of the £500 per month tax free income she desires and the balance can be invested in her ISA to provide tax free income or lump sums (or death benefits) in the future.
After 6 years she would almost exhaust her pension fund but, dependent upon growth, it may even then be possible to defer the State Pension to fully exhaust the fund and maximise the ISA investment (although it should of course be noted that this may not be sustainable if the value of the fund declines).