[snapdragon]

A big thank you guys - going out now to have a fiddle.
EDIT**
Great stuff- I set a new code of :-

code 1
1+2+8+16+64 = 155
code 2
2048+16384+32768 = 51200
code 3
65536

TOTAL CODE = 0116891

I hope I did that right, I have all the correct options afterwards anyway.

I also set these adaptations (although some already set and others not implemented)
06 0=intelligent aux heat/vent
07 1=shut off time aux when ign off
08 1= voice recognition quiet mode
16 1=activate aux heater if required for residual heat function
18 0=shut off when energy manager says so
19 0=use aux heater when required by heater demand
20 1=rear heated seats not switched off after 10 mins
21 1= add another line to MMI

I hope to add the valve and electric pump to the Webasto heater one day.

Rear heated seats still don't work.
Fuses OK, switches show as on, MMI shows them as present and on.
I have disabled the 10 unoccupied minute timeout.
Seats remain cold.
I looked in measuring blocks of 08 HVAC and can see the temperatures of the seats as ~8˚c and it also shows all 4 seats as unoccupied even when I sit on them. Maybe that is the problem?