In Answer to Q1
Both Prototype Concordes, 001 & 002 along with the Briitsh Pre-production Concorde has escape hatches.
The prototypes had a rear 727 style hatch, a Mid and Front escape trap door.
The Pre-production aircraft had the mid and front escape trap doors.
The assemblies has steel ramps would have dropped down into the airstream, to allow the crew to bail out even at high speeds....and avoid the wing!
Have a look at this page for the ones of the prototype
http://www.concordesst.com/002/002detail.html
And this page will show you a couple of shots during the testing the pre-production's escape hatches prior to its first flight
http://www.concordesst.com/history/b...ingfilton.html
Gordon.