Lobbying groups. One of which advocates for a Palestinian state alongside Israel, which is essentially opposed to Likud policy.

lobbying, any attempt by individuals or private interest groups to influence the decisions of government; in its original meaning it referred to efforts to influence the votes of legislators, generally in the lobby outside the legislative chamber.

Again, that hardly meets the “controls British politics” argument. An unwarranted and potentially scandalous level of quid-pro-quo/ influence sure - but the Russian money and rot is more important to root out of British politics imo