Well, yes you can, if it’s a defined contribution pension. You can (at the moment) take a lump sum tax free of 25% (this may change though) and once you’ve ‘crystallised’ the pension, any more money you withdraw will be liable for tax (currently 20% if you are a basic rate tax payer). This occurs whether you choose to take the money in total as a lump sum or as a monthly or on an ad hoc basis.
I had a final salary Local Government pension, which I was lucky enough to access at 60 (and retired) and a defined contribution pension, which I drew down until state pension kicked in (at 66). I then decided to buy an annuity so that I had a regular monthly income until I die. (No dependents - but if you do have family and want to leave money to them, I appreciate that this may not be an option).
The current ‘new’ state pensions is better than than the old one, but is still not huge, and while theoretically you CAN live off it, it doesn’t leave much room for many things people take for granted (like running a car for example or an occasional holiday).
Better, in my opinion, to see what you are likely to receive at state retirement age (soon to be 67, and rising), any private pensions you are projected to receive, take off the personal tax allowance, and then you will know what your ‘income’ is.
Yes, anyone with a personal defined contribution pension (not defined benefits pension) can do it, but I would be conscious of the tax liable (20% if you are a basic tax payer, and higher if you are a higher earner). A pension is a privilege (if you’re lucky to be in a defined benefit scheme, and fortunate enough to pay into a private pension scheme.).
I would say use it wisely. Yes, I know anything can happen, and who knows what the situation will be in the future (I wish I had a crystal ball). Just don’t blow or spend recklessly a pension just because you can. I don’t think any Government would reduce or stop the state pension in the future (it would be political suicide to all parties) but, in my opinion, the triple lock isn’t sustainable, and pensions do need to be reformed at for every politician party who comes to power in the future.