Navigation reset

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Mazda CX7 Diesel 2.2
Hi all,

I have a 2010 2.2d CX7, it came back from a non Mazda garage after main service, where I assume they disconnected the battery and now, although the sat nav works, it appears to have defaulted to a German profile. It still shows where I am, but the problem I have is that when trying to input an address in the UK which will start with a post code which has two letters (ie IP294ux) it doesn't do it as the default setting appears to ask for a number first, and won't give the option of putting in a letter. When I try using street names instead, this won't work as again it won't recognise UK streets. Worked fine prior to the service, but I've left it too long to moan at the garage (I don't think they would know the problem anyway). Don't want to take to main dealer as an hour's labour would pay for a new TomTom so not worth it. Anyone got a clue?? Can't find anything similar on the internet. Help!!!!!
Ps. I've selected English as the language, but it appears to be in a different region zone and don't know how to reset this aspect.
 
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