wxPython has been updated to 3.0 in F22/Rawhide.  Unfortunately, london-client fails to run:

[talbert@localhost ~]$ london-client 
London Law does not appear to be installed.
Attempting to launch client from current directory...
Traceback (most recent call last):
  File "/usr/bin/london-client", line 29, in <module>
    import londonlaw.guiclient
  File "/usr/lib/python2.7/site-packages/londonlaw/guiclient/__init__.py", line 26, in <module>
    from wxPython.wx import *
ImportError: No module named wxPython.wx

Debian has patched their londonlaw package.  Their patch would likely resolve the issues:
https://sources.debian.net/data/main/l/londonlaw/0.2.1-18/debian/patches/wxpy3.0-compat.patch