I have resolved the issue with the following example:

http://www.timmitchell.net/post/2010/08/23/ssis-conditional-file-processing-in-a-foreach-loop/

What I realised was that I needed to just ignore the current log file which gets created daily, so using the above example (and changing the last written date to created date) I am able to ignore/skip the log thats in use.

Adam