Back in the office after the holidays I did a quick search of the QinetiQ records and came up with references to a RAE Report from the Aero Department (Departmental Note No136) on the Flight test of Typhoon R7576 to reduce CO2 contamination.
There were also another 12 reports on Typhoon CO2 contamination and other serials mentioned in the titles were. R7595, R8925, R7617, DN409, EK271 and EK286.