We have developed a number of school websites directly with the headteacher or the school business manager. The concept was that the head was there to run the school, the admin staff were there to run the office and the teachers were there to teach the children. It was unfair to add another piece of technology for a member of staff to use or the addition of further responsibility onto already overworked members of staff.
The schools just simply emails me with any information that needs changing or updating and I maintain the website for the school.
We do also provide CMS for those schools that consider updating the school website from within the school. Full training is provided by either one to one training or the manual that is provided.
The main reason we work in this way is that at the end of the process the school gets the site that they want and not the site based on a fixed template.