I think whatever work was being done was triggered by the new Mersey Crossing scheme. As I have said before, look at the Mersey Gateway website and look at the scale of what is being done, and we cant even re-instate a double line Railway!
If NR can't get the Re-Signalling work done as promised (Grand Weaver -Wavertree scheme) then they should be Forced to re-instate the Chord on the original Signalboxes. That after all, is the only reason they were built where they where, in the last century.
Halton Junction and Frodsham Junction, just put the junctions Back!