Info received today at Williams re the ECU, thought I would share.....

MMC have recently removed the ECU upgrade from the option list for the Roadster due to problems sourcing electrical connectors. Working towards a solution but no time frame.
As a result have put my Roadster order on hold.

Thanks to Adrian for the education.....

Mike
1982 4/4
1999 +4
2004 Roadster S1
2010 Roadster S2
2021 Plus 6