yes do get advice it's much better regulated than it used to be (it used to be 'put your money here and I will get all of the first few years interest as commission thank you very much').
if it is a final salary pension be especially careful, probably get several lots of advice.
assuming it is instead a defined benefit scheme and you are over 55 check any transfer out fees but consider putting it into a SIPP where you can invest it as you like in funds/shares/bonds, take 25% as tax free cash and thereafter as much as you like out as cash, ideally just enough to stay below the £10K per person tax threshold so it will be tax free as well.
also if you don't pay tax now there is a nice little earner where you can pay in £2,880 each year, tax man adds £720 and you can then withdraw both sums a few weeks later - £3,600 tax free if you stay below the £10K threshold, and NI free anyway.
also check you have a full state pension coming
http://www.gov.uk/check-state-pension if not might be worth topping up your contributions