Generally speaking, yes, from age 55. However, pensions are designed to support you throughout retirement and withdrawals in excess of the tax free element (usually 25% of the fund) are liable for income tax at your marginal rate. If you take all of your pension in one go it’s likely that you will pay a heavy tax charge, some of which you might not be able to reclaim. Although it might sound appealing and you are happy to pay the tax, you need to consider the potential risk of running out of money in retirement.
We recommend that you take regulated financial advice. The Financial Conduct Authority register lists regulated firms and advisers in your area.