The VEPs went 38 years before they ended service.
mods note - split from this thread:
Southeastern metro fleet replacement/improvement
Southeastern has announced that Alstom, Siemens, CAF, Hitachi and Stadler have been shortlisted for an "Invitation to negotiate" for the SE metro fleet replacement or improvement. Proposed (but not guaranteed) features include air con, toilets, level boarding of some sort, and on-board...

Many of the Southeastern ones barely reached 30 years, being from the final 1974 batch, but there was a safety issue related to their withdrawal which doesn't apply to the Networkers.
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