I just fixed it by adding an explicit anchor to the Wikipedia article, so that the old URL will lead to the correct section again.
I also fixed the redirect from Meek's method to Counting Single Transferable Votes so that just linking to http://en.wikipedia.org/wiki/Meek%27s_method without any section anchor will lead to the correct section.
In fact, this is what we really should do: just link to the redirect and let the Wikipedians take care of it at their end. (In particular, if anyone ever writes a stand-alone Wikipedia article on Meek's method, that's the URL where it'll go.) However, with the section anchor workaround I implemented, this is not quite as urgent an issue.