Clause 17 refers to the reasonableness of doing work ordered by a competent authority. It means you didn't pad your account. This concept of reasonableness is linked to the actual work undertaken. We're not talking about what's reasonable within the context of a particular total liability limit; we're talking about reasonable costs of the work that you've been ordered to do. If you were ordered to do something and you did 47 other things that cost a whole bunch more money, you're not going to be compensated. It's like that. You are going to be compensated for what you were ordered to do by a competent authority. So there's an objective trigger to what you're compensated for.
On November 30th, 2009. See this statement in context.