Radio interference was on a failing alternator on my student 2CV 20 years ago - it sounded like a distant police siren when accelerating (that disappeared when the radio was switched off) ; nothing like that on this car. I do have a 140A spare alternator obtained off Ebay that I was planning to send for a refurb service, assuming that the alternator on the car would have seized completely, instead of which the one on the car spins as smoothly as a baby's posterior but doesn't have a pulley on it. Am just locating a baby hacksaw to clean up the end where the spline bit needs to insert as the car is too far from the house to get an extension for the Dremel. Weather also conducive to car work today at last.