I think you can have a registered address for contact. i.e. A solicitors P.O.Box.
In honesty, I wouldn't worry about it. Only had 2 unwanted visitors from E-bay in 10 years, one was an astoundingly beautiful woman (twice as surprising considering what I sell), the other was a problem I have to admit. A guy returning items who stepped in to my house the second I opened the door. I bodily threw him back out again.