Dash light flicker (318D)

Hey Guys,

I very recently bought a used 318D (2010) in very good condition with about 49,000 miles on it. I just recently noticed when I start it, the bulb warning light comes on and every 20 seconds or so, I see a flicker with the lights on the radio/aircon area.

I have uploaded a YouTube video of the flicker, you'll see it 13 seconds into the video.

https://www.youtube.com/watch?v=2Y0tsaOJUMs&feature=youtu.be

I've left it back to the dealership where I bought it (www.johnhayescars.ie - it's still under warranty) but they said they couldn't see it. It's hard not to notice the big bulb warning light that comes up when the car is started.

Any ideas?