Mike Bristow wrote:

I can't actually recall seeing services advertised on the indicators as
running through to Hainault-Woodford

I've seen services going through Leytstone as on the boards as
Woodford via Hainault. I think there's a 3 or 4 TPH service doing
that route. But I don't know if those trains turn into city-bound
trains at some point on the loop, or if they terminate at Woodford.

Wouldn't a once round the loop service potentially cause Circle Line style
chaos on the line, being so long and potential to delaying other routes?