Having searched the topics on this I still don't seem to have come across a solution though frustratingly someone has resolved this problem without explaining how!
Anyway the following msg is the result of trying to log in. I have two blogs and they are both affected in the same way.
You don't have permission to access /blog/wp-login.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I have tried changing the permissions on the .htaccess file and I have tried changing the content to:
but no joy.
The fault has developed after being able to loggin with no problems to both blogs and without any recent changes. Very odd.