Hi Jenny,
You can file a complaint with the Irish authorities. The link is in my first post. If that fails you will need to file a claim in Small Claims in Ireland. This can e done electronically.
http://www.courts.ie/Courts.ie/Libra...4?OpenDocument
I would try the aviation authority first. The airline will often cave in at this point.
The UK and Irish systems are not the same, so not sure your mate in Manchester can help...