Mesothelioma is a latent injury caused by exposure to asbestos dust and it is difficult on the present state of medical knowledge to pinpoint when precisely it is contracted. This was highlighted in the decision earlier this year in Bolton Metropolitan Borough Council v MMI and Commercial Union (2006), which concerned a Public Liability cover which (typically) covered for "injuries occurring during the period of insurance". It was held that the disease (mesothelioma) occurred when the suffering started - not at exposure.... .