Roles and permissions

I sorted out the problem. I was attempting to restore a course with an account with the Manager role into a new course using Settings : Front page settings > Restore.  I had set the capability ignorefilesizelimits for this role but when I checked the Front page permissions with Settings : Front page settings > Users > Permissions > Check permissions I found that indeed the capability ignorefilesizelimits did not include the Manager role. So I added this and, hey presto, Managers are now able to restore courses > 128Mb to new instances from Front Page restore.