Originally Posted by
sbm12
Nope. You won't have physical access (UA isn't in T4) nor would you be permitted in with the credentials you presented.
Ok thanks

Physical access is possible though? I've transferred between terminals before, both using Heathrow express and the transfer buses and they don't seem to mind what terminal the boarding pass is for. I'm asking this because I want to try out the T3 lounges (AC/SAS, SQ).