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Dear experts,
I am making my application for British citizenship. In Section 10 (Supporting documents - page 31 of the latest application form), it is stated that I will need to provide evidence of National Insurance contributions covering the relevant (5-year) period which includes:
- payslips
- P60's
- Letters from employers confirming I have worked in their employment including start and finish dates
Do I need to provide all of these 3 supporting documents or one of them is sufficient? I am a bit confused as if I need to submit all the payslips for the whole 60 months, the application file would be too heavy. I have already got the letters from my employers (including the current one). Thank you very much and look for ward to hearing from you soon.
Best regards,

Only one of the three types of document NOT all of them.
Easiest would be letter from employer(s) especially if you have been with one or two for a long time.
As you already have letters then that's sufficient.

Thank you very much for your response. I have one more question and hope you can clarify it for me. In Question 1.49 I need to state my Tax reference number. Is this the Tax code such as 1185L?
Best regards

No it isn't your tax code. It is the employer tax reference number which should be in your P60 or ask your HR.

Thank you very much. This is very helpful.