Ended up with a solid 80 mins to connect. Will never find out if security was open as we ended up being assigned a bus gate.
Flight connections felt chaotic but made it from plane to connecting gate in 45 minutes with enough time to grab a coffee before boarding again.
This was one of my favorite transits through Heathrow in years. For whatever reason all the staff and passengers I’ve encountered are in a good mood and are being good humored, even at the X-ray machines.