I thought you said you wanted paying for half the man hours for this ;)
I'm pretty sure that this has combined with the UK geo filter to produce some interesting results.
For example one site was #1, on both .co.uk and .com, for a while. Two things noted in analysis were:
2. Lots of links exchanged from their UK site with somewhat topic relevant US sites.
They are now still #1 on .com but have dropped to #4 on .co.uk. It looks like their geo weight has been tipped towards the US. Perhaps reduction in internal link value coupled with a few more US links has tipped the balance.