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Hi mike, we do have webmaster tools set up and I will take a look at Screaming Frog, as it looks like an efficient piece of software. I should have probably been a bit clearer in my query though. Will Screaming Frog tell me which internal links are pointing to 404 pages? The only way I can think of checking this at the moment is to go through every page on the site, checking each of the links to see if they go to the correct pages.

Brilliant thanks Dan. This is what I'm going to do.

That's why I mentioned: "eventually". But thanks for the added information. Hopefully it's clear now for the original poster.