Please don't send me an email an hour before quitting time slightly modifying a complex financial structure that requires seven interlinked spreadsheets to be solved iteratively on a day when one co-worker is in London and we've been annoyed to death by various other centres (you know who you are, Tokyo and Mumbai), especially when the said seven spreadsheets are in Excel and thus vulnerable to crashing at random inopportune moments, and even more especially when you preface your email with "I need this urgently for tomorrow morning's meeting where we finalise legal terms." The words 'urgent' and 'finalise legal terms' are actually antonyms; it's like comparing milliseconds with eons. And when you ring a few minutes later to ask me to check my email because you need it tonight, even though your meeting is not until 10am tomorrow and you cannot provide a reasonable reason why it must be had by tonight instead, be preapred for the answer.

No, you can't have it.