You can view a cached version on Google if you know what you're doing. Here's page 54 for example.
http://webcache.googleusercontent.co...&ct=clnk&gl=uk
If you want a specific page just go to Google and type
glasgow (page number without brackets) site:www. pprune. org (without spaces)
Then click the little drop down arrow next to the result and click 'cached'.
Users should not be able to delete giant threads like that. I'm a member of loads of other forums and this is the only place where it happens. Admin need to fix it.