I've copied the text from the application website below.
Quite specifically, it asks for a passport with an entry stamp.
The passport used when he first entered the country was damaged, and had to be surrendered when a replacement passport was issued.
The text then indicates we could include letters as proof. It does not indicate what kind of letters, so probably *any* letter from *any* government department will suffice? So long as it's addressed correctly in the UK of course.
Lastly, he does have a certificate of police registration - which is stamped and dated for every address in the UK over this time period. Surely this would suffice as proof of living in the UK, but I would would feel more comfortable if anyone can confirm?
It is quite clear that bank statements and bills generally are not suitable.. A letter from an employer is not possible to obtain.
Thank you all in advance, this forum truly is an incredibly helpful resource.
Proof of living in the UK for <redacted> for 5 years if applying in your own right or 3 years if applying as the spouse of a British Citizen
If you are a Non-EEA National, you need to include your passport to prove you have lived in the UK for the relevant 3- or 5-year period.
If you do not have your passport or it was not stamped when you entered the UK, you need to include letters (for example, from your employer or government department) as proof.
Bank statements or household bills are not suitable proof you have been living in the UK.