I'm in the same boat as Brian.
Have been with HC Energia since we bought from new in 2008 and have never received a bill. We get regular water and electricity bills to our post box no problem.
I think the direct debits were set up by our solicitor on purchase. I've previously tried to go online to see if I could access any bills with no joy.
So if you have any success Brian, I'd be grateful to know!
The only consolation I have is that the amounts collected by direct debit seem reasonable.