Have you seen the queues lately. If you phoned me and asked if i could come down early, I would look for any excuse not to add to the queue. I have been advising employers to give staff an afternoon off to go and complete paperwork and avoid delays in getting paid. As long as you have proof that an event is happening, it makes no difference if the paperwork is in a few days early. You wont get paid for the time before only from the 29th, but at least it will be in the system.