This is a slightly different scenario, but I move home a lot and when I moved a considerable distance, thought it would be wise to update the passport to my latest address. I phoned them to ask if I could just write the new address in, to be told No that would be defacing it and making it void. I was supposed to send the passport back to them and pay a 10 pound fee to have it updated. Considering I'd moved five times in the previous 4yrs alone and if I updated it every time it would cost me a fortune, I didn't bother. Nobody has come to arrest me yet!