From the website of the Commonwealth War Graves Commission:
"Following extensive consultation with users of the popular CWGC website, we have made several changes to the “Search Our Records” section , which will make it easier for people to search our database of 1.7m Commonwealth casualties. However, a technical problem has affected these changes, which has required the temporary reinstatement of the previous search tool.
"It is our intention to adopt the improved system, once the technical problem has been resolved. As well as providing a more intuitive system, the changes to the records search facility allow for greater security of our database but regular users may wish to note that one of the likely results of the security upgrade is that external websites will be unable to take advantage of the links to individual casualty details which are currently available.
"We are confident that these changes to the search facility represent a significant improvement on the previous system and that users will find the changes useful."
It's a shame that external sites will not be able to link to individual casualty details but presumably CWGC has its reasons for including this restriction.