Originally Posted by
msm2000uk
From experience, flights from LGW have just Row 1 blocked off, whereas flights from LHR seem to have Rows 1 and 2 blocked.
Additionally, on summer flights from LHR (to NCE at least), rows 1-3 are blocked for GCH only.
I suspect that it correlates with the total number of rows initially set aside for CE, and doesn't necessarily have anything to do with departure/arrival airports.
On most of my flights ex-LHR (which have small CE cabins to row 3 or 4 at most), it was only row 1 that was blocked. On flights with larger CE cabins (LPA to row 12, for example

), row 2 was blocked too.