No fee to register. Registering doesn't start any action of any kind.
If you do a claim application there is a fee for that that you pay up front (see below)
If they get a claim pack and decide to pay you directly, not through the process, it actually becomes complicated and you then have to decide what to do. I've not had that happen myself.
My understanding is that you either cancel the process and lose your fee, or continue with a reduced claim to cover court fees.
(There are lots of guides to this process online btw)
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