Robert Woolley writes
AFAIR, the signalling equipment on the Northern Line north of Camden
Town dates back to the 1940s.

1935-40 New Works Programme? On the Barnet branch at least, everything
north of Archway was new build or converted from an LNER branch line -
so it would have had to been resignalled then.

Resignalling will cure the problem.

I wonder if the current Northern line trains were built to allow for a
future conversion to Central line style automatic train operation.

--
Dave