I thought it was P45's that related to, which you can keep but you're not allowed to re-issue. Failing that you can request an employment breakdown from HMRC for the relevant year, which will give you the pay and tax.
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John
Any advice given is for general guidance and professional advice should be sought applicable to your circumstances.
Ring the income tax helpline on 0300 200 3300 and they will send a copy out.
But first I would email the payroll dept of your employer and ask for the pay details to 5 April 2015. I can't see any reason why they shouldn't be able to do that.
I had a similar issue with a client who had worked part of the year, and not kept the details. All it took was a letter of authority from my client and his employer gave me the details without any problem.
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John
Any advice given is for general guidance and professional advice should be sought applicable to your circumstances.