Originally Posted by NWIFlyer

I believe this is incorrect as there is a nuance to this. A BA Gold card holder travelling on EI from DUB to London (and specifically London, not other EI destinations) is entitled to access to the EI lounge in T2. This can be any fare basis, and does not have to be ticketed by BA.

Unless the rules have changed, I did this on a cheap fare a few years ago, and indeed on revenue fares you also earn a few Avios.