Having got so fed up with the wrong titles on the HDD recordings, with no expectation of a fix from Sony, I've tried to see what I can do to rename the recorded titles.

I've been using a WD Essentials 300Mb drive for recording.  The Bravia TV has formattted it into a number of partitions and volumes, not recognised by Windows, but readable in Linux.

As you'd expect, the largest partition has the actual recordings in a "stream" folder. But in 2 other partitions, there's a "db" folder with a file "0001.db" - which is a SQLite database.  These 2 copies appear to be identical.

The database is a pretty straightforward list of the recordings with - hurrah! - a "title" column.

So all you have to do to correct the recording titles is:

1. Get hold of a Linux system with SQLite database browser.

2. Edit the titles in each copy of the database.

What could be simpler? (well, a Rename option in Title List?)

PS. No sign of the Recording Results list...