Hi,

I will be arriving in T5 from Paris on BA and flying out via the same terminal (about 5 hours layover). I would like to head over to T3 to use the Centurion lounge during my layover and was wondering if that is possible/easy.

I've tried researching this and it seems I can just transfer between terminals via airside on the Elizabeth line train?

Just wanted to make sure it is as fuss free as it appears or is there anything I need to look out for? Waiting times? Clearing of security etc?

Thanks in advance!