Hello, my name is***** am a qualified lawyer and I will be assisting you with your question today. If you are genuinely self employed then you are correct, because redundancy is only payable to employees and if your employment status is different, such as self employed, a contractor, an agency worker, a volunteer, etc you do not get the legal entitlement to a redundancy payment. Maybe when you changed from an employee to self employed you could have argued for redundancy because your employment position was being closed and it could have amounted to a redundancy, but it is way too late to challenge that now as there are strict time limits to make a redundancy claim, which would have passed years ago.
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