That's a poor multiplier - most schemes work on 12x rather than 10x.
At 10x (assuming you are 65 and in decent health) the pension is theoretically the better option - but a tax free lump of ten grand might be very useful to clear any other existing debts and/or buy a car, holiday etc.
My husband was also given that choice, we decided to go for the lump sum plus a monthly payment, on the belief that once we had the money, it was ours, and we could put it in a savings account, but if he was to die, then the amount that I got was very small and the lump sum would not be an option then.
As others have said it depends on your circumstances- age, health, current debts (if any) and whether the pension is indexed linked.
Another factor is whether you are a taxpayer. The lump sum will be tax free but the pension will attract tax at 20% if you are a taxpayer.
factor30 You say the lump some is tax free all or some of it? Would it not take me over my personal allowance? Could I reclaim some back year ending April 2013
A lump sum from a pension is all tax free, regardless of whether you have no other income or an income of millions. The amount you can take tax free is up to 25% of the fund value. The ongoing pension income is taxable, however, provided your total income (including state pension) exceeds the personal allowance.
Your figures don't seem to quite add up to me, unless these are just two of several options put to you. If the £10000 figure is the maximum allowable tax free lump sum then your fund should be worth £40000, so the figure of £2500 a year is equivalent to 6.25% of the fund value. So I'm not sure why the lower fund value of £30000 (ie after the £10000 lump sum) gives a pension of only £1500 which is 5% of the revised lump sum.