There has been ongoing issues with ordering telephone lines from BT, along with broadband products, on GWP for some time now.
A new Facebook group has been created named ‘Openreach GWP Didcot’ which hopes to resolve these ordering issues, please note this is a closed group that you will have to request being a member of.
https://www.facebook.com/groups/openreachgwpdidcot/
This group is for residents of the Great Western Park only. I will provide as much information as possible reference to FTTP (Fibre to the Premises) and PSTN (Public Switch Telephone Network) services. You can request access to this group and once I can confirm your address I will grant access. This site is only for your phone service issues and in no way can I order phone lines for you or speed up any orders but only give you a jargon free update about GWP.- Mark Watson, 'Openreach GWP Didcot' Facebook group admin