Hi,
However, according to the BA website;
http://www.britishairways.com/travel...o/public/en_gb
The two NRT flights will move from Terminal 4 to Terminal 1 as from 26th October.
This will only affect your return flight ( arrive from NRT at Terminal 1 then head to Terminal 4 for your BOS flight).
You will still get the Concorde lounge at departures in T4 both ways ( to HKG and then to BOS)
Regards
TBS