There was one passenger service due to use the chord this week (Mon-Thu) due to engineering, but these got capped during the last week or two. The next scheduled use for passengers is in July (same deal, one train a day, MThO).
interesting always wanted to do this one, very rarely comes up in passenger service iirc.
Managed to get it in on c2c's (excellent) "last blue train" tour a couple of years back. Was probably the only chance I'll ever have to do that section..
When c2c services use Liv st on weekday evenings for engineering works it's usual for the last Fen St departure to go down there to Stratford.
Also, there always used to be an ecs from Fen St in the morning about 9.30 that went down there. I used to see it disappearing down the chord if I went into work late. I'm too diligent now!
I have a look in Real Time Trains yesterday and these appear to have been removed from the timetable. As I recall it a down working post morning peak and an up working at the back end of the evening peak.