That's the only complaint I have about the F lounge at LGW. Maybe I'm just unlucky but whenever I am there it is full of loud mouthed prats on their mobiles and there is no escape as there isn't a quiet area.

I have found looking at them, listening intently and writing down details of what they are saying and any phone numbers they mention seems to put them of quite successfully

I was once in the lounge when someone from my company's main competitor was sitting at the next table having a very detaled conversation about some private company business. When he had finished I told him who I worked for and thanked him for the information - his face was a picture