This is the perfect place to discuss this.
Once you move to Ireland and you (EU citizen) starts working, then your entry into the UK is covered by EU law.
You have threw options:
(1) You can apply for an EEA Family Permit. This provides proof that your wife can work, and is expecially good if you want easy relaxed entry into the UK, since it is predocumented that you can enter
(2) You can also go into the UK without a visa:
http://eumovement.wordpress.com/2010/08 ... to-travel/ (though you must carry proof that you have been working in Ireland).
and
(3) You can enter because your wife has valid permission to be in Ireland (because of the CTA)