The shop working on my Elise removed the axle from my car yesterday and called me to advise me of the problem, but I had not seen it for myself until this morning. Turns out the shaft of the axle had not broken as I had been led to belive. Instead it was the CV joint in the middle of the right rear axle that had failed. Apparently the failure has been going on for some time which would account for the clicking sounds under certain load conditions.
Strange thing about the failure is that it looks like very little, if any, lubricant was applied to the CV joint when the axle was assembled. The boot covering the joint was in excellent shape and will be reused. The clamps securing the boot were tight also. It is remarkable that the joint lasted 65K miles with so little lubrication.
Good news is that the CV joint seems to be rebuildable so it does not look like I will be needing to spend $1,200 on an axle assembly that would take several weeks (at best) to get from Lotus.
Should have the car back on the road tomorrow. Will be checking the other CV joints to be sure they have grease.
O5 Elise Full Lotus Sport Ohlins Suspension Upgrade, Katana 2