There's an ex Norwich 745 which departs Stratford for Liverpool Street at about 42 minutes past each hour.
I've never really been sure if these are officially set down only at Stratford - I did a few of them yesterday, and on the information screens they were simply advertised as a service to Liverpool Street only with no mention of set down only, so even if they were in times past I guess they aren't now.
They are advertised locally at Stratford for pick-ups towards Liverpool Street