My concern is that PC may not have actually thought about this before doing all the pre orders as they weren't around for MP5 and may not know the requirements.
I would have thought they would need a special import licence and then be required to only sell to those with permits.
FYI I obtained MP5 and got the permit. Didn't cost me a cent, no cops have ever visited my place, and the permit lasts 5 years. Not a real hassle and I'd rather ensure I legally own it.