It no longer accepts new posts so I started a new thread.
I have sent a report to the webmaster on the hope that be or she will address the problem.
We know this is very unlikely to happen but I sent the report/request anyway.
This is what I wrote
"Brexit Progress Update
There is a problem on this thread (and potentially others).It is not accepting new posts.It does allow you to make a post but this post is not archived correctly and so the new post does not show up in the thread once it has been posted.We have had this problem before.Often once a thread gets to a certain (perhaps10) number of pages any new post will no longer be added to the thread."