Transiting at LHR - Terminal 2 B gates to A gates
I am a US citizen who will be transiting from a UA flight (EWR originating) to an Aegean flight (to ATH) in Terminal 2 at LHR later this month. The UA flight will land at the Terminal 2 B gates and the Aegean flight departs from Terminal 2 A gates. What will the transit process look like? Will I be able to access the Plaza Premium lounge at Level 4, Terminal 2 Departures? Thanks for any help you can offer.