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the 'echo' your getting is a PHP statement. within those "" should be the rest of the code to display your site.
Does this happen on any other pages?
i.e - try the admin login page (which iirc is: blah.co.uk/wp-admin/)
if no other pages are doing it, try re-uploading your index.php and overwrite the current one.
if that doesn't solve it get on to your hosts and ask them to take a look at it.