[Arran]

I've picked up some interference from the LED counter top puck lights in the kitchen, no so much on the AM broadcast band but on shortwave, but it's not the LEDs causing it so much as the switch mode supplies up in the attic radiating through the wiring. The way that I have them connected is so the switch mode supplies are plugged into an outlet up in the attic that I can switch off from the kitchen, should the need arise to replace the switchers with proper linear supplies, with a mains transformer, it's easy to do. I also had LED Christmas lights going 24 hours a day 7 days a week for about a month and they don't interfere with anything, those are connected a series-parallel arrangement I think.
Regards
Arran