Assuming you haven't received another tax-free lump sum in the last 10 years AND that you didn't receive a tax free lump sum from an occupational pension scheme when you were made redundant, then I calculate the tax free amount to be €37,080.00, broken down as
€10,800.00 - Statutory (€600 x 2 weeks per year x 8.5 years + €600 bonus)
€26,280.00 - Increased Exemption (€765 x 8 full years PLUS €10,160 PLUS €10,000)
which means only €6,200 of the €43,280 is taxable at your marginal (highest) rate
Then as T McGibney states, this €6,200 will qualify for top-slicing relief
I would ask your former employer for a breakdown and also ensure that the figures are included on a P45 so that you can reclaim any overpayment of tax from Revenue.