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The site has been live for a week.
I uploaded a robots.txt file to the site then asked WMT to analyse it.
It gave a date and time that it said it had analysed it, one that was just minutes ago, and said that it was a 404 error - but the date and time it gave was a time that was after the robots file had actually been uploaded.
That date and time should be suppressed and replaced with a "not yet crawled" message, and a guidance to check back later.