redundancy payment and tax credits.

I have lost my job through armed forces redundancy. Does anyone know what I have to declare of my payout?. It was all tax free above 30,000. Tax credit office said I should `put it on end of year form, she didn't have any idea. Im not sure what I have to declare,nothing on website. Can anyone help. Even though it was all tax free do I just declare above the 30k?
Thanks