Proof of cohabitation

[Lopilo5678]

Hi all

I am new to this forum. My wife (from Korea) and I are due to apply for the extension of our spouse visa this year but I am concerned about the proof of cohabitation requirement.

We have lived together in my flat in London which I own for the past 2 years (since our marriage visa approval). And we have been in a relationship for 8 years.

However, we receive very little correspondence and we have not been savvy enough to put aside the correspondence we received during the first year of our cohabitation (we did not know that this was a requirement). Without the bills/ docs etc is there anything else we can do to fulfill the requirement or any advice from people who have been in similar situations?