Dear mr.ianwilson,
Thank you for your feedback.
Are you using an iPhone? It is is currently not possible to perform call diversion changes direclty from the device for the iPhone 5c/5s/6/6Plus iOS 9 users.
Please send me your mobile number by private message, I would be happy to do it for you.
Kind regards,
Cordialement, best regards
Leyla (modératrice, moderator)