Here are some resources about musicians of the improvising persuasion in England, Ireland (all of it), Scotland, and Wales.
None of these resources will ever be complete. To think that a living web resource should be complete is to misunderstand the nature of the World Wide Web.
Greater context comes from the user, not the resource; if you use these resources, you can refine your personal context from the wider context of the resource. This wider context is given in the first sentence on this page (in bold). Stated plainer: the contexts are improvising, music, and the geography of Britain and Ireland. There is no hierarchy; everyone is equal in size on all the resources.
These resources are free to use; designed or devised by me (and in the case of RHIZOME, with Tom Ward); and made better by all who have contributed.