I not sure if this link has been posted here before (except by myself)..A search was inconclusive
Its a link to Hondas review of its third era activities .. ie- until they pulled out in 2008-9.
It reviews most parts of the car including engine , gearbox , chassis , materials , ERS , MGUK and controlling software. And it incudes details on how they were going to improve the car for 2009 ,upto when the hammer blow came.
It can be downloaded as a single 16Mb link or individual topics.
https://www.hondarandd.jp/summary.php?sid=23&lang=en
It is a free download , but you do have to register . but a fantastic insight.
Rob