Default template is English (US)

Hi, when we create any new Office Document via the 'new document' button in SharePoint 2010 the default proofing language is always English (US).... No matter if the Regional settings in the Site Collections are English (UK), or the default in Office 2010 is English (UK)... Is this 'by design', is there a 'simple' way of changing this (if possible).

Thanks very much...