It is my understanding that the Chair is one of many on a board of Trustees. So, for example, Trustees expenses will be recorded with the Charity Commission annually.
The current issue is Fae. The last time I started to rant, it was about Roger Bamkin, and Monmouthpedia. In the latter case, he stood down as Chair for discussions about Monmouthpedia. For me, that does not cut the mustard. As a Trustee, there are very strict rules about gaining financially from projects which are run under the umbrella of a charity. I am informed no rules have been broken.
Wikimedia UK is a very young charity. Soon, let us all hope, it will become a teenager.
Gordo