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...

And stations at which LO is the only NR service have lost their
double-headed arrow.

Bizzarely Gospel Oak has retained its BR symbol.

Are youreferring to the actual station, or the line maps in the underground
carriages?

According to that Overground 'branding guide' someone found and linked to a
while back, all the actual stations except those on the existing ELL keep
their 'National Rail' (BR) symbol, as they are still on the national
network.

But there are separate rules for line maps on platforms etc, and the NR
symbol only occurs at the 'end stations' where there is parallel running, or
at an interchange with the rest of the NR network.

Paul