Thanks a lot guys, I did wonder what the yellow plastic tool was for, now I know. Didn't have this issue with my previous 09 XF and the new car wasn't supplied with a handbook. [Now obtained from good old Ebay]. I have to say, this low mileage 13 plate 3. 0 S diesel Portfolio is a superb car in every way, except for the out of date sat nav but I can live with the smart phone alternatives, particularly Waze. Having said that, I would prefer to utilise the built in system but resent paying something like £150 for an upgrade. Shame on you Jaguar, the replacement discs for the previous generation were superior in every way, easier to use and around £28 on Ebay for an updated disc.