In message , JNugent
writes

"University Way" (part of the A206), which is inside the M25, but which
is not in London. The new-build part (which is now about ten years old
anyway) is in Dartford, Kent.

I am not aware of any other significant highway building inside the M25
(whether inside or outside London) in the last 20 years, let alone 10.

There's the Thamesmead-Erith spine road (Bronze Way), opened in 1997,
but the A23 Coulsdon By-bass, opened about 18 months ago, is the only
one built in the last decade that I recall.
--
Paul Terry