Additional information:
The currency for the Aer Lingus vouchers matters. More information here under header "Does The Currency The Voucher Is In Matter?": https://sparefare.net/blog/Can_I_Sell_My_Aer_Lingus_Voucher
Aer Lingus vouchers are transferable to someone else via the Name Change function on their website. The original registered holders of the vouchers don’t need to travel on bookings made using their voucher.
More information here: https://sparefare.net/blog/Can_I_Sell_My_Aer_Lingus_Voucher
The Vouchers also can't be used for: Bookings that involve flights operated by a partner airline or any airline other than Aer Lingus or Emerald Airlines; Group bookings; Price Lock and Deposit bookings; AerClub Travel Reward Tickets; Change fees, additional fares for reissued or partially used tickets; Travel insurance; Car hire; Hotels; and Inflight purchases.
More information here: https://www.aerlingus.com/support/booking-flexibility/vouchers-information/#/tab-2-using-vouchers
