There should be some paperwork accompanying the payment that should be dated and give the answer.
Dangerous to assume, but I'm guessing that the person in question was trying to get the sum within the tax year ended 05/04/17 at the last minute?
More or less, yes. They were going to do it a week earlier but forgot. When they finally remembered, it never occurred to them that these things don't happen overnight and it took a couple of days for the payment to come through. I'm not sure if it was arranged online or over the phone but either there should be written confirmation somewhere so I'll ask what this says.
Thanks for your reply.