Quite why these 322s were allowed to be released by One is a very good question, they were in the franchise as replacement for the final 312s and trains are not frequently short formed at peak times thanks to a lack of 321s.
Amusingly on one what seems like every Saturday Southend & Metro service is formed of 1x321 (or 315), whereas in FGE days, and in one's early days, they are all 8 car. Whilst there's enough room, it feels like a peak time train, certaintly either a money or maintenance saving idea.
All Saturday Metro's are 4 cars nowadays but in the run up to Christmas nearly all services were 8 car. The same formation remains on the Southend Line however many Mainline services to Braintree & Clacton are 8 cars however are usually less loaded even with 4 cars!
Well, if it wasn't for the SRA, 'one' could have fitted a couple of 312s with central locking for use on peak services, and the 322s wouldn't have been required. FGE even proposed a major refurbishment including modifications to allow them to run OPO (in particular a door to allow access between the passenger compartment and the cab). Just like with the Cross Country HSTs, the SRA said they had to go, regardless of the fact that this left a general shortage of AC EMUs. Sadly, unlike HSTs their is no option to take them out of storage since they have all been scrapped now. A very wasteful way to deal with perfectly good trains that were less than 30 years old, with the last few in service being only 25 years old at withdrawal, and newer than the majority of Mk3s 'one' is now getting.