In version 9 this has become much simpler.
- Go to Home > People > Staff.
- Go to More... > Email weekly timetable to FOUND SET
- Select the Monday date of the week you wish to send the timetable for.
- The email template will appear, showing the content that was last used. Edit as required.
- Continue, and each teacher's timetable will be added as an attachment to the email as it is generated.