I hope this incident gives Network Rail the impetus to replace the headspans remaining between Padd and Airport Jn ASAP.
I thought they'd planned to do this, but obviously they haven't completed the upgrade.
When the line was first electrified, it was just HEX units using the wires. But with the intro of IETs, 387s and, more recently, Lizzie Line units, it's used much more intensively now.
Ideally, the removal of headspans should've happened before the Lizzie Line opened, so as to provide separate independent wiring and structures for the main lines and the reliefs.