I meet quite a few people on business skills courses who have been through a redundancy process and are receiving a payout as a result.
Redundancy payments greater than £30,000 are taxed at source, so I'm often asked how you get the tax back if you've been taxed too much for that financial year.
I'm no tax advisor, but this link might help:
www.gov.uk/claim-tax-refund/youve-stopped-work
It's part of the new-look GOV.UK site, where HMRC has been migrating lots of useful guidance.
A few years ago I also ranted slightly about a related issue.
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