Car died with switch on. So, I would think it would burn the starter up in that case. On re-start, you turned the key back on, and starter engaged with or without the clutch disengaged? And, the radio turned on? Isn't there a safety switch on the clutch arm, that doesn't allow the starter to engage unless the clutch is disengaged? I don't own a clutch/stick XF, but I would think it would have one of these. This certainly wouldn't explain it dying or the radio coming on though. First time hearing of this problem. But if that switch does exist and it shorted, maybe...???