BT charge ISPs for terminating users

Normally when a user gets ADSL, there are charges to set-up the line. That could be through BT Wholesale or via an LLU (local loop unbundling) operator. Those charges may be hidden by the ISP/etc or built in to the set-up charge.

If a user then migrates to another operator, that's fine too.

However if a user happens to cancel their PSTN service, say they move house, the ISP may be charged £33 for the "cease" request even though they've got no control of the user.

There must be a sensible rational behind it somewhere.