Sorry macari, forgot you were asking about "In sickness..." by time I answered the question.
"Till Death Us Do Part" was released by Network DVD, they are most likely to be the ones to release "In Sickness..."
http://www.networkdvd.co.uk
though it isn't on their forthcoming list as yet.
This cult web site would list the title if any other company plans to release it...
http://www.zetaminor.com
click on "DVD" and then the "Incoming" link.
All DVD releases have to be passed by the BBFC ( I have searched the title and it doesn't show up )
http://www.bbfc.co.uk/recent/index.php
click on "recent decisions" and then "video and DVD".