This emerged in testimony at a British court. The guy might be a complete liar though.
This was kind of amusing:
Who WAS Immy???
"When I was in Pakistan, me and Cash [Mr. Babar] talked about Immy, what's he going to do there," Mr. Khawaja wrote in one e-mail. "We have a suggestion for a one-way operation to the most high, maybe in Yahoodi land."
It was not explained who "Immy" was. But "Yahoodi" is an Arab term for Jews, and in common parlance "Yahoodi land" could refer to Israel or to the West in general.