Originally Posted by
Del Prado
When checking in to a busy London approach frequency, when there are so many first call items to remember, if the QNH is forgotten it's no big deal.
The QNH will be provided on first descent to altitudes so the initial omission of QNH is saving the controller's time.
Personally I don't see the point of announcing the QNH on check in to approach along with the ATIS, A/C type, cleared level, routing, etc. QNH is a mandatory readback when first cleared to an altitude, so why clog up the RT. Announcing the ATIS you've copied surely implies you have the QNH anyway?