LR
You are right about WJ731, the Canberra B2T. I flew it a couple of times on the OCU in 1976. The nav fit was quite advanced compared to a normal B2. It had, IIRC, a Green Satin (or was it Violet Picture but I don't think so) doppler along with its associated GPI Mark 2. Twin VOR, TACAN and ADF.
BS