aakk9999 - 6:34 pm on Nov 15, 2012 (gmt 0)

I can now check in WMT to see what pages are linking to the 404 page

You do not need to wait for the WMT report - and if you wait, this may take some time. There are tools that you can run against your site which can tell you this. It is better to fix the problem before Google gets it than to leave it to Google to discover it and then go and fix it.