Just as an update. I travelled BHX-DUB on 1st May on an 'I' class Aerspace ticket. Nothing has posted to my BAEC account yet.
When looking at claiming missing Avios (/TPs) on the BA website, Aer Lingus doesn't appear in the standard flight claim airline list and requires you to complete a separate table which you can't submit until 30 days after the flight.