Now, if you want to be different and you are actually Irish.....

Then it gets better.
If you take advantage of the fact of using your Irish Republic dual nationality, then you can bring your asawa in the UK using the EEA Family Permit route.
It is faster, It doesn't cost anything at all and as an EEA Citizen it is your Godgiven "right", they may huff and puff, but as long as all the documents are correct they cannot refuse the Family Permit.