Is there an upstairs in that building?
To clarify,it was once when staying in sandy lane [ground floor luxury ocean room and it remains my favourite!] that we when traveling Cw paid for Iam jet access.
That was 3 years ago.
The first time we went to Bgi,the iam centre was not available for cw check in/luggage on its own as it is now.
personally I found being driven to the plane and last to board a special experience but the lounge cramped and a disappointment.
So at all other times we just used the airside lounge which wasn't there either untill a few years ago as you know but others mightn't.