I'm flying MAN-DUB on a BA codeshare with EI so I hope that the hand baggage comments still apply especially as EI have given me contradicting answers about my cabin baggage allowance.
An EI agent via Chat said that I had a Economy Smart ticket so I didn't need to buy priority boarding to be able to take my 10kg hand baggage onboard. However, the Aer Lingus app says that I have a Saver ticket which according to their website doesn't come with cabin baggage. All very confusing but I take comfort in the information above.