What is the date of birth of the harry you are looking for?
There is a Harry Clarke from hampshire area who served on HMS Prosperpine in World War 2 son of Elizabeth and William Clarke.
Clarke
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Clarke family tree, and connecting branches and roots, from Hampshire, UK to the Titanic and beyond. We have links for the name CLARKE obviously, so many others, see the whole list. If you have a link to our tree, or would like to put out a request for genealogy assistance, email pauly @ this domain I will try to help... This site is also home to my weblog, with links to all the things I like. It's all about me, my lovely wife + our beautiful boys... Also the usual things, work, Television, running, ect ect, + links to my fun projects.