I remember my tracking number hadn't moved at all when I got the email, but it had a pickup scan I think around 5.30 or 6. I suppose Sheffield has a pickup at the end of the business day, or maybe someone drops them off at a UPS dropoff point after leaving the office. Either way, I suspect they send the decision email as soon as they have actually made a decision, but then it takes some time to package everything up to send back, which would explain why some people have it sent the day of and some the day after.