Clean and 321/4 refresh are 2 different programmes.
321425 back in service today after refresh (this is carried out at Clacton Depot). Catch it out and about and take a look for yourself.
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Was it the rumour that was never substantiated?
NXEA refurbished the 321s outside but not inside. I am talking about the internal refurbishment of the 321/4s.
Some of the rail press use the word "refurbished" to describe routine overhauls. So it's not surprising people and messages get confused!
Repairs to the bodyshell and external repainting is a routine overhaul, not what most people would consider refurbishment. Overhauls are done every so many years to tackle corrosion among other things (they also do work to major components under the skin that make the train work).
During the last overhaul on Class 321, the interiors were also refurbished so it was an overhaul and refurbishment. This time the interiors are not being done, so it is just an overhaul.
No refurbishment was carried out by NXEA on Class 321.