Not for a long time. 22001 was the test bed for IEHS and was semi-permanently formed for a good while with 22002 as a "6" ICR. When IEHS was dropped, 22001 became the test bed for ETCS but was done in a way that the equipment could be swapped with standard equipment, thus only withdrawing the set when required. 22002 returned to being a 3 ICR and part of the usual fleet with no restrictions.
With 22039's incident in Westport, it was decided to swap 22202 with 22139 to retain a 6 ICR with NIR equipment, and reallocate the centre car from 22002 to form another 4 ICR.