There do seem to be missing signs at other places, like ones at the top
of the first set of escalators closest to the MML platforms, to indicate
additional routes to the tube via the platform level concourse.

Frankly, signage around the whole of St Pancras is absolutely dire.

Some signs say East Midlands trains, others say Midland Mainline, and the
worst ones of all say "UK Trains" when pointing to the EMT platforms, and
completely ignoring FCC. When I started getting confused where I was going,
and I probably have far more vested interest and prior knowledge to general
travellers, I knew it was bad.

The information displays are equally awful throughout the station. The big
station-wide board at the entrance to the FCC platforms lists all UK
trains - but not in departure order, but by train company - not that this is
stated, and at first glance is just a random selection of trains in a random
order.

The FCC platform ones are hideous... the Calling At line can only show 2
stations at a time and don't scroll. They don't show numbers of coaches or
location of First Class, and as others have stated, are currently having a
problem getting the order of departures right.

I may be far too cynical here, but it seems that in their efforts to create
an arty farty "meeting place", the St Pancras team have forgotten about the
most basic elements... seatings, signage and information displays.