ohno - 5:37 pm on Sep 29, 2011 (gmt 0)
Just took a look at GA, results as follows :-
Domain 1, com, geo targets UK, traffic spikes on the 1st, 5th, 14th, 15th, 19th & 28th.
Domain 2, co.uk, traffic spikes 12th & 20th.
BOTH had a big spike on August 24th? For some reason the .com site looks much more erratic.