An Error has occurred! Unable to open configuration.php file to write!

This is driving me absolutely nuts!

I have taken a backup of my online site and am working on a local copy prior to upgrade. Apache is running as www-data and i can see that configuration.php is writable by that user as are all the directories. However, 'Directory Permissions' in admin tells me otherwise.
There are old (server) paths in the config visible through admin. These are unchangeable. It's as if the installation is looking at a completely different config file to the one i'm editing and it has the old server paths in it, but HOW could that be?
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CEHJAsked:
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CEHJAuthor Commented:
Sorry that doesn't help - $live_site and $ftp_root are always empty with my sites and the paths are set to the right values. The config file i'm looking at through admin is clearly the wrong one. Where it's 'coming from' is currently quite beyond me
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Peter HartCommented:
you need to edit the configuration.php file and change the paths you find in there.
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CEHJAuthor Commented:
Yes, i know that, but the problem was a little different. (See below)

The ghastly truth is that what was happening is that index.php was doing a redirect (because of a dodgy webroot) and because i'd forgotten this, i was actually getting redirected to the live site as opposed to the offline one
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CEHJAuthor Commented:
Sorry folks - thanks for trying, but my stupid error!
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