git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18524 b5f69653-2bf5-0310-8201-b0dafb8e1405
git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18525 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2228 The essential component missing from r18525

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18526 b5f69653-2bf5-0310-8201-b0dafb8e1405