Keith - many thanks answer. The calculation from the company's accountants of the redundancy payment - which is substantial at 307,000K - was based on an incorrect service record which overstated my overseas service. It listed not much tax on the UK portion - seemingly just taxing the pay in lieu of notice and ex gratia payments, not the severance itself. But the calculations included tax on US and Japanese service which was erroneously long. I think that I still qualify under section 3 (employment exceeds 20 years and half of it was abroad) with my correct service record of 27 years, with 14-5 years abroad and 13 years of it foreign service in the last 20 years. I want to confirm that. The accountants' calculation includes tax on my service in the US and Japan that seems unduly high - basically 6 years of my 27 years that I was in the UK they have assigned incorrectly to my postings in the US and Japan. That tax sum deducted /Japanese tax amounts to about 30K and I suspect the deduction should be smaller than that, without me going over the threshold and becoming liable on the UK service. How on earth do I check whether it is in my financial interests to challenge my service record, as HR is reluctant to review it and the company accountants won't recalculate correct service without authorization from HR?