The tax free cash element is always tax free cash when drawn up until age 75.
What quite a few people do at 55 or over is crystallise their tax free cash element with the drawdown payments - so assuming no other income stream they can draw approximately £16,666 per annum out of their pension tax free annually. 25% of that is their tax free cash and the balance is their annual taxable income allowance of £12,500. They are then only using a small amount of the TFC.