Naturalisation certificate number

Hi

I'm applying for my wife's naturalisation. On form it asks for my naturalisation certificate number. I arrived back in 1979 as a child and do not know where my certificate is. Can I put my passport number number and beside it write passport number?

Thanks

I can't speak from experience but I would think this should be fine.

By the way - you can't apply on your wife's behalf. She needs to apply herself.

I meant I'm filling in the form etc

Thanks for the reply