Joe,
I have seen info on the 2 Scimitars and 2 Scorpions, but it does not appear to explain the ORBAT or use of the Scimitars and Scorpions.
I am very sure that there was 3rd and 4th Troop of B Squadron, The Blues and Royals deployed to the Falklands. The two Troops appeared to have worked together once and for the most part were always attached to Infantry or Para Units. The Troops each had a mix of two Scimitars and two Scorpions.
Timeline-
21 May, 1982
-Both Troops landed at San Carlos, one with 2 Para and 40 Cdo, the other with 42 Cdo and four Artillery Batteries.
31 May-6 June 1982
-3rd Troop provides security for the move of 3 Cdo's Brigade HQ and are joined by 4th Troop to move closer to Stanley.
13/14 June, 1982
-3rd Troop provided fire support to 2 Para on Wireless Ridge.
13/14 June, 1982
-4th Troop provided fire support and diversionary forces for the 2nd Scots Guards at Tumbledown Mountain.
Here is an excellent reference site:
http://www.naval-history.net/NAVAL1982FALKLANDS.htm