SCCM MDT integrated OSD keeps defaulting to US region and language Windows 10 instead of EN-GB

[RoryMac]

Hi please help I'm pulling my hair out! After imaging a client with Windows 10 using SCCM and MDT integrated task sequence the region and language keeps defaulting to US region and language. I have altered the MDT unattended XML file to add EN-GB as this:

SetupUILanguage>
                <UILanguage>en-US</UILanguage>
</SetupUILanguage>
<InputLocale>en-GB</InputLocale>
 <SystemLocale>en-GB</SystemLocale>
  <UILanguage>en-US</UILanguage>
  <UserLocale>en-GB</UserLocale>

I have also added these to the customsetting.ini file:

SkipLocaleSelection=YES
 KeyboardLocale=0809:00000809
 UserLocale=en-GB
 UILanguage=en-GB

 SkipTimeZone=YES
 TimeZoneName=GMT Standard Time

The image was captured with the UK region and language setting set for all users in Audit Mode. And still after deployment the language is set to US!!! I also get "something went wrong" before login after  OSD. Any help would be much appreciated