I have started collating records for the Maddrens who served in WW1 and WW2.
Their record are available on Archway. https://www.archway.archives.govt.nz/SimpleSearch.do?keyword=Maddren
Richard Henry Maddren - Richard is unique, he served in South Africa, then in WW1 and then WW2
Robert Charles Maddren - served in WW1.
Colin Edward Maddren - served in WW2 and unfortunately was killed in action in Italy in 1943