According to notices placed on stop U immediately outside Tottenham Hale
station, route 123, 230 & W4 heading eastwards are not stopping there
due to congestion. No road works in the area and nothing mentioned on
live travel news on the TfL website?

Any idea what's going on?

And on the subject of the 230, this went over to double deckers at least
5 years ago IIRC. Tottenham spider maps (possibly others?) still show
the route as a hail & ride from Wood Street station to the terminus at
Upper Walthamstow.

--
Phil Richards, London, UK