please empty your brain below

Caledonian Road and Barnsbury
Sorry, yes …. Not only does imperial wharf have ticket barriers, it has TWO sets, one for nb trains and one for sb trains, so it’s totally possible to accidentally tap in a the wrong gate line, realise you’ve entered on the wrong side, and then have to tap out again (and be charged for it) so that you can tap in again on the other side/gate line.
Kentish Town West,

Finchley Road & Frognal
(1st update)
I’ll put in a FOI request to get the definitive list
Wandsworth Common

dg writes: not an Overground station.
Most of the line from Liverpool Street to Cheshunt is without barriers.

dg writes: Mathematically incorrect.
Highams Park definitely has barriers.

Clapton and Rectory Road do not, or didn't last time I used them.
To clarify a lot of the inner London part of the Cheshunt line is without barriers, such as Cambridge Heath, London Fields, Bruce Grove, Stoke Newington and potentially more
(2nd update)

[and still incorrect]

Stamford Hill has no ticket barriers
St James St does indeed have barriers. I kinda wish it still didn't, as that make things easier with bike.
"Gates" please, not barriers. My one-time boss (Dave Field, the LT Automatic Fare Collection Engineer) would have had a fit. Gates can open to allow people through, barriers don't.
Crouch Hill?
Kensal Rise also doesn't have ticket barriers
(3rd update)

[and still incorrect]

Anerley, penge west (last checked july 21)
Harringay Green Lanes & Woodgrange Park
Woodgrange Park has had ticket gates for five years.
Bushey (yes it is a London Overground-owned station)
Definition question: if the overall station has gates, but overground platform only has validators (for interchange to NR) does that count as gateless or gated for your list?

dg writes: No.
(4th update)

[and still incorrect]

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