Cant answer question, however when I taught part time at the college in St. Albans few years ago I was driving a rover 214 SEI and every time I parked in their staff car park my radio wouldn't work and the central locking always malfunctioned.
I had to use the key to manually lock / unlock it. That was the only place I had problems with it in all the years of ownership. All I could think was there was a high voltage cable near the surface radiating some sort of electrical radiation. I know they should be screened but maybe there was a fault.
Also, areas that use a smart barrier (bar lifts as you approach) have a circle of live wire (approx 20ft in dia near the surface.
The idea is, the windings generate a weak magnetic field that as the car body enters the field it interrupts the field and a sensor triggers the barrier to lift.
Just a thought 
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