Hi x-man, Jason, thanks for the replies.
I've now set up a Cascade Ring Group, picture attached, with Reception as the first member, Lorna as second, Sarah as third, then Richard as fourth, with the timer set to 5 (seconds?) each.
Richard has the voicemail set on his extension, does this mean that I don't need to set a VM as an overflow since Richard's should always push to voicemail if he does not answer?
Thanks again