I departed last Friday evening and security was quick, now I didn't time it but I wasn't standing in a line, there was 6-7 lanes open at around 20.00. If anything slightly to many for the time of day.
Immigration when I arrived last Thursday morning was busy but again lines kept moving, probally only around 5 minutes. It was also well staffed.
T1 in general has greatly improved, differently up to standard as T2, while lots of shops it's not the pain that LGW South Terminal and they have done a good job with the arrivals area.
Any idea when segregation of A gates will be complete and I assume BA are getting air bridge?, also A gates 221-224 are new (?) took a stroll down and BA, KLM and EI around each gate yet only KLM appear to be actively operating there.