But no services shown out of St Pancras ?

Probably because (Midland Mainline) services out of St Pancras dont
stop anywhere inside the London Connections map area, the same as GNER
services from Kings X are not shown[1]. Though, FGW services aren't
shown[1], and I seem to remember they had a select few services
stopping at Slough.

[1] All these services Are shown on the Ldn & SE map on the reverse
though, like normal.