It won't be "WIPO case", it will likely be under the UK (Nominet) Dispute Resolution Service, which will cost them nothing, except whatever extra fees, if any, they pay their lawyers. He is unlikely to be contacted by lawyers directly.
If they're an established brand in the UK, which seems likely by the way he avoided my post on the subject, and they can show his registration was bad faith, ie trying to capitalize on their name, then he'll probably lose the name, but won't AFAIK, be liable for fees, costs or compensation.
If the name isn't that important, it might be worth responding and stating you don't believe they have a right to the name, but you'll sell it for $50 or something as an act of good will.
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