From their site:
"We expect authors of research papers to maximise the opportunities to make their results available for free."But that is not all - they do offer to help support OA publishing fees on top of the research money they dole out. Truly putting one's money where one's mouth is.
Their full policy can be found here and they summarize the policy in the five following bullet points:
It is really quite awesome actually - they even focus on openness and not just on "no cost" access which many organizations do not seem to understand. Any and all medical funding organizations that do not have a policy on open access should check out theirs. Way to go Parkinson's UK.