Positive 1,
i am on one of the six estates you refer to above, I am also the individual who was advise by Santander that your legal cover in home insurance would cover you for this as it is impacting your estate and mortgage conditions, I..e. Title deeds.
I have also been in court on 5 separate occasions to date, during which greenbelt and bto solicitors have sought and been awarded continuous adjournments.
I would strongly recommend you have a look at the homeowners rights network webpage and join the social media group as there are almost 700 people in a similar situation to you, who are all actively helping each other.
Thanks, Gary