OR IF YOUR ON THE ELECTORAL ROLE, N216 is the bailiff non service form which they then return to claimant.Its worth a look.
you have to think logically though about doing this as nothing is fool proof.
If your advertised in a public place they know your taking the piss.
Plus what they seem to be doing is ignoring the court rule or serving CCJ's on last known addresses waiting for some silly sausage to say five years down the line "how comes i've got a CCJ when i was'nt there?" to which they will reply "ok we'll squash that one but heres another one now we know where you are"
Like i say,dont do this if you have a house.
I'm toying with sending letters from various C/O addresses and not replying to the one's that come to mine.
FUCK ME light bulb moment

how's about finding an empty re-possessed house and screwing your own lockable post box to the front gate and using that address

and answering all their letters for a bit then start returning them
Infact tell the bank you've moved there before you stop paying
sorry nearly pissed mi sen then