No you wont. They dont back date them, only from that date onwards. Otherwise all cars without dpf and cats would fail.
One of the main focus points of the new test is to find cars where DPF has been taken off or gutted.
So yes the test will be back dated to when DPF's were mandatory fit to all new cars.
Proof, source?
The original problem detected that the car was being put through an efficiency AND emissions test on a rolling road, under certain lab conditions, not just simply being revved when stationary for an emissions test.
This should make zero difference.
I agree, yes the Euro emissions ratings are determined based on a rolling road test that sees the vehicle accelerate very gently, and the current MOT test is done stationary and is only looking for excess particulates or soot.
However the revised MOT test will take detailed measurements at different speeds and loads – tests that seek to recreate realistic driving habits.
Vehicles that emit excess levels of pollutants would need to be tuned or repaired before they passed the MOT test, this test includes CO2 and NOX tests on diesels.
So the VW "cheat" where emissions are kept low in slow acceleration lab based tests, will not work when car is undergoing the new MOT test with varying speeds and loads, so you will need the fix to pass the test, and you will need to repair or replace your gutted or removed DPF as well.
The equipment and procedures are all ready in place for rollout, it just needs the Department for Transport and the DVSA to say when, they originally said they wanted it all in place "by 2018" , but as part of a revised Roadworthiness Directive which came into force from May 2017, requires an updated MOT in force before May 2018, I can see it being end of this year early next.