To quote from the report...
"After both throttle control levers were advanced to the takeoff position, the No 1 engine thrust reverser locked but the No 2 engine thrust reverser remained unlocked for the rest of the flight. Engine thrust increased on the No 1 engine but the No 2 engine remained at idle thrust."
"During the deploy command, the FADEC software logic restricts the fuel flow to approach idle fuel flow until a signal indicating 78% of full deployment is received, regardless of throttle control lever position."
http://www.aaib.gov.uk/cms_resources...LK%2005-12.pdf
So it appears that with the FADEC systems, the thrust lever can be physically moved forward of Idle while in reverse.