hereby indemnify and will keep indemnified the Commonwealth, its officers, employees and agents from and against all actions, claims, demands, costs and expenses (including the cost of defending or settling any action, claim or demand) made, sustained, brought or prosecuted in any manner based upon, occasioned by or attributable to any injury, to any person (including death) or loss of or damage to property which may arise from or be a consequence of any unlawful or negligent act or omission of the person or organisation, its officers, employees or agents in carrying out the activity.