As a data point - I submitted my form at around 2200 last night and received no email. There was one waiting for me this morning that had been sent around ten hours later. I have now sent off the required material for confirmation. All quite painless.
As a further note, When i created a new Eurobonus account (never had one before), I remembered that I had taken an SAS flight just over a week ago which hadn't been credited anywhere. I submitted for Missing Points and was immediately credited with the flight. I wish BA's IT was only that efficient.