Home Office Ref

[Fm831]

I am a British citizen, my wife is applying for UK spouse visa, the form asks if the sponsor (me) has a Home Office Reference number. Does she still has to write my old Home Office reference number which I used to have 20 years ago prior to obtaining UK Citizenship? Or she just should select no and provide my British Passport copy?
Thank you

[seagul]

I am a British citizen, my wife is applying for UK spouse visa, the form asks if the sponsor (me) has a Home Office Reference number. Does she still has to write my old Home Office reference number which I used to have 20 years ago prior to obtaining UK Citizenship? Or she just should select no and provide my British Passport copy?
Thank you

If you don't know/remember then you can safely skip it as it is not compulsory to supply "if not known"