I was specifically refering to the T5 arrivals lounge landside.
VintageKrug, I believe that you are wrong regarding the eligibilty to the lounge. It is not available all to all inbound Club as Club Europe are denied access, only Club World have access.
I can only confirm over the last few months to seeing pax passing over vouchers to gain access. I have no idea what these vouchers are, but they obviously do exist.
The reason I was given when asking about the need to show both the boarding and gold card was “there are alot of scams about”.