Hello Lucy,
I can't help with Bulolo Cemetery, but I am researching the same Clarke family from Birmingham and would like to exchange information with you. My Clarke family tree is on Tribal Pages. If you would like to contact me, go to
http://www.tribalpages.com/index.html?m=1 then in the site ID box enter birminghamclarkes. This will bring you to the William Clarke Family home page. Click on Request an Invitation and follow the instructions.
Dick