Hello,
The Bank's Registrar (per their Investor Relations webpage) is:
Computershare Investor Services (Ireland) Limited, 3100 Lake Drive, Citywest Business Campus, Dublin 24, D24 AK82, Ireland. Telephone: + 353 1 247 541.
I'd give them a call, explain the situation and expect that they'll be able to help.
You might run into an issue with them looking to apply a charge, to arrange a new share cert, so ask what the alternatives are:
* can they hold them electronically for you?
* can they transfer them electronically to your Stockbroker account (if you have one)?
* can they sell them for you?
Check what, if any costs, will apply to each option available.