This is Marc Kelso - Half Lit World, i never knew it was a portishead remix but you learn something new every day. Its hard to pick up as it never got officially released but i picked up a test pressing from ebay if i remember correctly. Here's his email from the copy i've got [email protected] . Good luck and hope this is the one your after (was included in some Tiesto sets from last two years or so). Take care, Tom