I will be flying BHD-LHR on bmi into terminal 1, and then LHR-EWR on CO out of terminal 4 (all on one ticket) in early August. Upgrade space into Business First has opened up on the LHR-EWR leg, and I am contemplating whether it is worth it to spend the miles+$500 copay. This contemplation has lead to a few questions that I have been unable to answer via google and various websites... 1) As an upgraded (vs paid) BusinessFirst customer, would I still get lounge access at LHR, and arrivals lounge access at EWR? 2) The BHD-LHR leg will be in economy... will I still get lounge access at BHD? 3) How does the SkyTeam lounge in Terminal 4 (which BF has access to according to CO.com) compare with the bmi or Star Alliance lounges in Terminal 1 (would I even get a chance to access the terminal 1 lounges, or do arrivals skip the secure area?) 4) Is there a business class benefit for inter-terminal transfers at LHR, or is it the same bus for everyone? Now, with the steep copay, these questions are largely academic, but my curiosity has been raised.