An LPA is not valid until it has been registered at the Office of the Public Guardian (the ‘OPG’).
There is a fee to pay to the OPG (not to us) for this of £92 per LPA-PA or LPA-HW
If you are on low income or benefits or in some similar situation, you may be able to apply for a 50% or even 100% reduction of this fee. See here for further details.