Armstrong Family Law. Inspirationally named Armstrong Divorce Law, the app "is designed to be a comprehensive and easy to use reference for Divorce Law in England and Wales". It "does not replace the need for a Solicitor, but provides much needed advice and explains in detail the procedures, law and key points associated with divorce and separation", including financial information. The app is available in the iTunes store for £4.99.
[The title to this post is not just me being facetious - it comes from the highly predictable first comment to this article about the app in the (Colchester) Daily Gazette.]