Yes Pontius, "Descend to Flight Level" same as "Descend to 3000 feet", and if ever you want it, I can scan you the ATM ,the swiss one, not the american one by the way
Strange I know, would be better to avoid that word, but still, I do not tend to lecture you on how to do stuff, but that's the way it is!
And yes, maybe not all BA pilots do the same, yet I still find it useless to have this:
--"Delivery
callsign stand A2, B737-800, request clearance Information Oscar, QNH 1004"
--"
callsign delivery, cleared to EGLL, via (SID), squawk 5773"
--"readback of clearance"
--"
Callsign, correct, QNH 1004, for start-up contact apron on 121,750"
The QNH is anyway said again from ground or delivery, so...
Better have some more words but be sure to have all infos than missing some by the way, as long as the one speaking doesn't seem to be sleeping on the radio!!
Take care and fly safe