Can phones be diverted? Can the air-conditioning, computers, fridges, etc be turned off? Is the location next to a communal space noisy; such as the canteen, toilets, or lifts? Our directional microphones can reduce, but not eliminate, these noises. If you can see the source of the noise it can be more acceptable – ie, a machine working in the background. If the interview is filmed in a meeting room hearing unexplained bangs and beeps, from seemingly invisible machinery, can be distracting.