Following a discussion with robertoemanuel the following approach was agreed to be worth of investigative research before being applied wider.

• ValidationRegistry held in Context.
• Reducer's perform validation whilst handling Action's.
• Reducer's are responsible for storing validation state in the ValidationRegistry.
• UI Components query ValidationRegistry to know whether they should render errors.
• UI Components can use "local state" until ValidationRegistry is updated as a consequence of a dispatched Action

This prototype is to test the above proposal.