I have responded to BA by email on the address that the email to my housemate came from [email protected] I think. I mentioned the case number in the email and detailed what has happened.

I am erxpecting that BA will either ignore me as I am not the person accused. My housemate has also emailed them with proofs that they requested and mentioned that he is aware that I have contacted them.

I guess my next course of action will be to follow up my email with a written letter giving them 30 days to resolve the issue before we persue through small claims.