At age 55 you should be able to take 25% of any stake holder pension pot as a tax-free lump sum i.e. £3,500. The remainder must be used to buy a pension annuity. Currently a pension pot of £10,500 will buy a 55 year old male, a fixed pension annuity of around £525 per year (£10 a week, fixed for life [taxable]).
There is one fly in the ointment – and that is whether the pension was contracted out, or contracted in (the State scheme). If it was contracted out – then the pension must buy you an annuity at least the level which would have been achieved, had you been contracted in the State scheme. Things are further complicated by the fact that the value of the State scheme is assumed to increase each year with a notional inflation figure. If your pension was contacted out of the State scheme, and the contracted in State scheme is forecast to payout more than £10/week at age 65, then your pension scheme cannot payout the money now.
However if your pension scheme was contracted in the State scheme, I can see no reason for you not getting your hands on £3,500 now, and £10/week for the rest of your life.