Departing LGW tonight on the LAM4M, couldn't get a word in on London frequency so on reaching DET29 i was about to dial in 5000 to be level at ACORN thus following the SID Vertical Profile when my Captain stopped me saying maintain 4000. Shouldn't we have followed the vertical profile? Been searching online but can't find a definitive answer/reference. For example what if terrain had been an issue?
Edited to add image of plate:
