Just did price check on LCY-DUB return 4-6 Sep.
Get this, on BA website it comes to £178. On Aer Lingus website it states (operated by BA CityFlyer) and for same flight it's just shy of £300!!!
Aer Lingus rip-off pricing never changes!
Then double checked what they'd be on Skyscanner and yep, rip-off price is there too.