You're right Angelo. Seems it's changed in newer 3597 firmware mate. Previously i've used both Luxembourg and UK without problem, now using them as the principal locale then selecting AU in the Developer Info locales results in a reboot and loss of the EU Speed Alert feature with a default back to AU settings. I don't recall which fw version worked as i stated, i haven't tried to use that feature for over a year, but it certainly doesn't work in V5.00.

Unfortunately setting to UK naturally results in complete loss of VC for searching in AU ['This feature is not available in Australia for British English']. Changing the Text and KB from GB to US regains it both with American & Australian TTS voice selected, but an Address search then only returns suggestions for US not AU even with a fix and despite the screen prompting 'Say an address in Australia'. All other search [categories etc] work as expected though. Because i'd rather have a fully working search by VC over an audible speed alert i'll stay with an AU locale i think but clearly to have all working normally a rollback of the fw would be needed on 3597 to have fully functional VC and the alert in AU.