If your pension includes a guaranteed minimum pension, you will have to take the part that relates to this as guaranteed income. You can then take the rest in any way you want, as described above. However, the amount of tax-free lump sum you can take may be lower than 25% of your total pot.
If there isn’t enough in your pension when you retire to cover all the guaranteed minimum pension, the provider will make up the shortfall. In these cases, you would only normally get an income from the policy, though it depends on how the pension is made up. Your provider will make this clear to you.