I hear that BAA has 3 ACJ's (?). The crews (Pilots and inflight) are easy to get along with.
Most ACJ guys are Chinese, as opposed to the biz jet crews, who tend to be mostly westerners. I hear it's old school, the Captains get waited on hand and foot by the FAs, and some crews smoke whilst in flight (I can't confirm this).
All the ACJ's are B reg, so you will have to get your B license.
Hope this helps
FR