Thanks to Cellery for pointing out the TR1A touchpad driver has been updated. The TR1MP driver has also been updated and is available on the UK/European site: .
This includes a fix for the Go Back/Go Forward feature which has never worked on the TR1MP.
After installing it the Back/Previous (as it’s obscurely called) visual indicator is turned off by default but the function works with or without it. I also had to re-enable my Left Corner Assign as it was set back to Nothing.
The Go Back and Forward function works in both Internet Explorer and Windows Explorer.
Nice one Sony :D