please empty your brain below

Woolwich DLR?
Not a new station location.
Meridian Water, replaced Angel Road but in a different location?
Essentially a replacement.
does Shepherd's Bush Overground not count?
Not a newly-served location.
Outside Greater London but within East Anglia, on the Greater Anglia Liverpool Street to Southend Victoria line, I think that Southend Airport station opened in 2011, between the existing stations of Rochford and Prittlewell
Added, thanks.
Why does Wood Lane count but Canary wharf Crossrail does not? Both are new stations next to existing ones.
Editorial judgement.

Well you learn something everyday - thanks, never heard of Mitcham Eastfields before!
The rarity of new tube stations does partially explain why so many (including me) have an otherwise irrational desire to go and see them.
Not including tram stops? Centrale December 2005
Not a station.
You've missed one NR station out. Meridian Water.
See 3rd and 4th comments.
This FoI response says that New Bermondsey/Surrey Canal Overground station is currently pencilled in to open in 2025.

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