Re: It's been years since . . . .
"I still have my virgin superhub even though I left them over a year ago.
Just in case they ask for it back, you never know..."
They are supposed to either collect it or provide you with a method to return it to them. They own it and are responsible for proper WEEE disposal. In theory. The reality is they almost always "forget" about hardware which is now obsolete so the user has to dispose of it. ie passing on the cost such that user either wrongly puts it in the bin or drops it off at the council recycling centre so they (we!) pay for proper WEEE disposal.
A little while ago I got a free upgrade from a Tivo to a V6 box. The V6 box is still here (sans the 500GB HDD, natch) because they really don't want it back.