Follow up from above. According to Dan at KH, Adrian's efforts led to the ARV6 mapping but did not filter down to Roadster production due to lack of emission compliance. This is born out in the fact that the admittedly useless fuel consumption bar graph display still works.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone