Join Date: Feb 2009
Vehicle: Grand Cherokee, CLK320, SLK350 (2012)
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Mine was set not to update automatically too.
To change - just set the Time Zone for GB, you get two options under GB auto change and non auto change.
Through COMAND:- SYS > Time > Time Zone > GB > auto*
*it doesn't say auto - it says something like 'winter time saving auto', can't remember off the top of my head.