I created a 2.5 site in a sub directory. Working fine.
Downloaded the content and uploaded it to top level.
Edited config file to reflect the new position.
Now I have an error
Parse error: syntax error, unexpected '=', expecting '(' in /homepages/25/xxx/htdocs/xxx/includes/framework.php on line 42
Sadly I deleted the content in the sub folder and on re-uploading it to that subfolder (I backed it up first) now I have the same error at this original location too, where all was working fine before.