The ORR authorisation to carry passengers for the 3-car units without first class (and non-ETCS 2-car units) was very specific in the number of units, so any flexibility there might have been didn't seem to apply to that step.
The rolling stock minimum requirements and specifications document is also specific regarding the planned
final number of "first class fitted" units (ie. 14 units leased from 31st Dec 2024). It appears that no first class would be offered before 31st Dec 2024. The flexibility (at least in that document) appears to lie in how they plan to suddenly introduce all 14 units into service with first class on a single date. Two options are given:
- first class ready (0 to 7 units)
- decommissioned first class (7 to 14 units)
The latter appears to simply be the "first class fitted" units with first class declassified, while the former has more seats (almost as many as the 'standard' 3-car units) but presumably could be quickly refurnished to provide the first class seating.