Originally Posted by
kirkwoodj
I would suggest Star Alliance Lounge, but unless things have changed, T1 flights to Ireland/Channel Islands are from a separate extension, and you wouldn't have access. Don't think you'll have much time on your hands, as you'll go through UK Immigration at LHR anyway.
Just a small correction, and it doesn't help the OP as they are flying on EI so wouldn't have access anyway, but what you describe above changed several years ago. Flights to Ireland still leave from a specific part of T1 (same as before) but you do have access to the main departures area including the shops and lounges there.