Thanks guys, I will have a go at it on Thursday (after the holiday).

Doc, I can completly understand your pain and frustration, we are in the process of doing the same thing, and I am starting with a class B that has been broken into class C and then further subnetted beyond that... Me and the other network tech, are still trying to figure out why it was done the way it was.... Ever so slowly though.
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Today is the tomorrow you worried about yesterday.