Thanks for the replies, I ended up getting a techie to run a script through the site for me which gave me all the info I needed.  None of the tools mentioned did exactly what I was looking for.

Any chance anyone knows any other tools I can use to crawl a site and give me a report of absolute and relative internal links?

Thanks for the reply although I've checked that add-on and it's not available for download anymore. Any chance you can send me the local files? I've mailed the admin but haven't got a reply yet.

Unless anyone knows of any other tools?

I'm preparing for a site migration from a .co.uk to a .com and I want to ensure all internal links are updated to point to the new primary domain.

What tool can I use to check internal links as some are relative and others are absolute so I need to update them all to relative.