I've just looked at the past papers available on the EdExcel website for November 2007 - the 360Science papers are extremely confusing - there seems to be two mark schemes for 5005 - B1a, one a pre-standardisation mark scheme and the second a final mark scheme. I assumed that this was the story for C1a, but they both are entitled "Mark Scheme (Final)" and yet while they appear to be for the same unit in the same exam period, the answers they contain are completely different. Am I missing something? Or is there a mistake somewhere?

There was a problem with the upload I'm afraid which is what resulted in the somewhat confusing options.  We've taken the system offline for the moment while it's fixed.  It should be back up tomorrow.