Maria Gomez

Hello, I have been requested my last P45 in order to apply for the U1 form. However, this was sent to an old address in UK. It's been two years since I left the country and although I have contacted the new owners of the flat where I used to lived, seems like nobody has received it. I have got in contact with HR at my old company and they told me they can't issue another copy. What should I do? Thanks