JSJ The S27/S32 split is as follows:
S27
o LTMA inbounds on BNN, SPEAR, LOREL + JACKO arrivals
o SU (Duxford), SG (Stapleford), SX (North Weald) inbounds
o MTMA outbounds with intention codes D, C, EB, EX, AM and AS
S32:
o LTMA inbounds that are to be level by PEPUL/DISIT
o MTMA outbounds with intention codes H, E, V, P
o AVANT-TNT northbound overflights
o All overflights
Those who are in the know may correct me, but I'm not sure the two sectors are ever split in reality - hence the fact S32 is not simulated in London Control.