As for the plane, engines 3 and 4 are visible in a 2010 photo.¹ By 2015 the ducts had all been covered.², albeit № 3 haphazardly in the rear.³
¹ https://commons.wikimedia.org/wiki/File:Concorde_(British_AW...
² https://commons.wikimedia.org/wiki/File:Concorde_2015-06_673...
³ https://commons.wikimedia.org/wiki/File:Concorde_2015-06_692...