The decision was taken by our intermediary’s risk management team and is something outside of our control. We’ve contacted them again and asked for the close-only status to be revised. So, I’ll keep you posted on what they say.
Unfortunately, there’s no way to predict this in advance.
We won’t be able to provide a list of instruments that have previously been in close-only mode, @Dougal1984. We put this information under the trading notice of each instrument, but if you have any questions about a specific one, feel free to DM me.