Hausfeld has filed an opt-out claim on behalf of over 20 million U.K. home insurance consumers against the companies behind ComparetheMarket.com, marking the latest in a stream of group litigation orders being brought before U.K. courts.

The firm is representing Home Insurance Consumer Action, which claims that ComparetheMarket’s “anti-competitive conduct” looks likely to have increased prices of home insurance for over 20 million U.K. consumers, Hausfeld announced on Tuesday.