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from their website:
"The litigation will be funded by a third party litigation funder. Accordingly, there will be no cost to you for joining or participating in the group action.

If we lose the claim, the funder will lose all of its investment. To offset its risk, the litigation funder will take a fee from the compensation awarded if we are successful. You should however still receive 70% of your proportionate share of compensation. If we lose the claim, we will not charge you for our time or the costs we have incurred on your behalf. The funder will simply lose its investment."

Seems quite straightforward, although I accept the T&Cs and small print are not published!