Eh?
It costs nothing to register with the
TPS or
FPS - that's all you need to do.
However, unlike me, make sure you get a printout of the registration details. The FPS are supposed to follow up on your behalf any complaints against anyone sending junk faxes. If memory serves me correct, they can be fined up to £5000. When I complained, the FPS just wrote back to me saying my number wasn't registered!