Hello all Umbracians.

For anyone fighting to find an answer to this, I realised Language is now tied to Domain, as its part and parcel of the same area in the back office.

So i've used the new DomainService to get at the code.

Here's an example for those interested, you may need to do more iteration than I have...

        public static string GetLanguage(int pageId)
    {
        try
        {
            // set default
            var languageCode = "en-GB";

            // try getting domain mappings for current page
            IEnumerable<IDomain> currentPageDomains = ApplicationContext.Current.Services.DomainService.GetAssignedDomains(pageId, false);

            if (currentPageDomains.Count() > 0)
            {
                // get code from first entry as multiple entries will always have the same language code
                languageCode = currentPageDomains.FirstOrDefault().LanguageIsoCode;
            }
            else
            {
                // if no domain mapping for currentPage, navigate to root node and get language code
                var umbracoHelper = new UmbracoHelper(UmbracoContext.Current);
                var currentPage = umbracoHelper.TypedContent(pageId);
                var rootPageId = currentPage.AncestorOrSelf(1).Id;

                IEnumerable<IDomain> rootPageDomains = ApplicationContext.Current.Services.DomainService.GetAssignedDomains(rootPageId, false);

                languageCode = rootPageDomains.FirstOrDefault().LanguageIsoCode;
            }

            return languageCode;
        }

        catch (Exception)
        {
            return "en-GB";
        }
    }