Andrews advise is good here. There is more of a legal obligation to mitigate rather than a specific contract clause to do so. You should be trying to minimise the effects of a CE without increasing your own risk or cost. Therefore if you can mitigate some of the effects then you should - and it would certainly be working in accordance with clause 10.1.
In the same way if you can prove that there was a missing link the other way, you could argue the same case if you became aware of it before the CE came along and (try to) justify that within the CE quotation.
In the same way if you can prove that there was a missing link the other way, you could argue the same case if you became aware of it before the CE came along and (try to) justify that within the CE quotation.