It will only be treated as a redundancy payment if it has been paid as a result of a situation of redundancy. This would be different from a pension plan which pays out as a result of reaching retirement age.
Also in case this applies, the disqualification from Jobseekers Benefit for those in receipt of redundancy payments in excess of 50,000 does not apply to those over 55.
Of course, for Jobseekers payment you will have to show that you are genuinely seeking and are available for full-time work.