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Ok. So some progress. But definitely not resolved yet. This was the response from Openreach to that form:
“I've looked into the provision of service to your property and find that there isn't any work to be carried out by the Newsites Team. The team that you've contacted specifically monitors progress of the installation of infrastructure to new developments that have been registered by the developer during construction of the site. We have no record of the development having been registered with the Newsites Team therefore there has been no Newsite involvement.
Your address is currently showing as a Silver Matched Address on our records, please contact your Serivice Provider and raise an order for service with them they will then liaise with the appropriate Openreach department to arrange for a connection to your property, subject to survey.