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Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
2) Yes, no need to apportion.
3) There is no requirement to submit supporting evidence to HMRC these days, just declare the income on your annual self assessment tax return using a Form SA105. Detained supporting data which you should retain might be needed in the unlikely evert of an HMRC investigation.
I do hope that you have found my reply of assistance.