I’ve just received the latest update to OSIs which appears to have been introduced in October. There are a few housekeeping changes including deletion of the now redundant OSIs between Blackfriars NR and Temple/Mansion House. They’ve also deleted the OSI between the parts of Wembley Central as you no longer have to leave the station to get to the Southern platforms.
On the plus side they have introduced a new OSI between Ickenham and West Ruislip