But the House has reformed the Lords repeatedly, and the Lords can't stop them. It's like the filibuster rule in the U.S. Senate which is constitutional becaus

But the House has reformed the Lords repeatedly, and the Lords can't stop them. It's like the filibuster rule in the U.S. Senate which is constitutional because there is at least one day in every term where it can be amended by a simple majority vote (and, in fact, it can be amended by a majority vote at any time and has been).