Can't coment on the EDI DCS departure but the GLA NGY1H goes the way it does so as not to conflict with inbound traffic routeing via Turnberry, we'll do our best to get an early left turn sorted if possible but sometimes it isn't.
As for the NGY1J it turns left at the GLG again to stop conflicts with inbound traffic via LANAK and STIRA again we'll do our best to get a n early right turn, but sometimes (usualy due EDI traffic) that isn't posible either.
The SIDs at GLA are due to be changed soon when we lose the AC, the GLG and the GOW, so maybe they ask us controllers what we think about how best to route the departures, but then again, do they really care what we think!!!!!