MOT Query if moving from NI to UK Mainland

[Orion21]

Hope someone here can help me with this as I'm not having much luck with google.

If I have a car in NI and first registered there that is say 3 and half years old but I then move to England and as a result have to reregister the car in England when do I need a MOT?

NI MOTs do not start until 4 years yet UK mainland is 3 years so I'm a little confused as to what would apply here?

Similarly would it make it make any difference if the car was 2 and half years old when moving to England as to whether it needed its first MOT at 3 or 4 years old?

 

[Orion21]

Did not realise there was a distinction between re-registering the car and changing the address.

So sounds like that I would be able to change the address to one in England but keep the car registered in NI?

How do I go about doing that? Is it just a case of keeping the NI number plate?