Many thanks to you all for your comments, I am now much more clear on the use of that facility.

That seemed to be the case Tim, so where do we go from here. Other than hitting "Divert" is there some other action to prevent loss of income. Stan, have you in actual fact ever used that facility, I'm not trying to be offensive, just asking the question as the option of using it can be quite ...

Many thanks Stan.

An obvious question which I cannot find an answer to. If real weather creates an unexpected problem, can I divert for refuelling purposes and then continue the flight to it's final destination?