Configuring preferences and options in Outlook.com
Thank goodness I'm not the only one seeing things!
I only just transferred my domain this morning to GoDaddy so that I could avail of the feature and went to the personalise section the option wasn't there even though it was previously.
Office support were also unable to help and I have raised a ticket with outlook support.
Hopefully it gets sorted soon as currently I have no email for that domain :(
Edit:-
Just raised another ticket with OUTLOOK support linking this thread, hopefully they make some movement one way or the other.