My experience is there is a fairly big delay in reviews showing up - but I would expect even the first review to get published within a month of posting should other ratings and reviews arrive for that app to separate it from an app that has less than 100 downloads ever.
I don't know for sure, but the ratings seem to be held back until 10 or 20 are submitted. Once you reach that limit the store will show the overall rating and only new versions get ratings once they hit their threshold (but a message stating not enough ratings are in to show).
It makes sense for users to expect a few points before any app gets zero or five stars and makes the ratings a useful measure that some handful of people expressed an opinion before they are shown.
After hearing about the delays, I've sometimes checked and my experience with about 50 reviews where I cared to check back, the shortest time was about 24 hours and the longest was 2 weeks for a review to appear. I've not had one not eventually get published, but I also don't generally review apps that have hundreds of reviews which is much harder to find your needle in the haystack of other reviews. I generally star those apps or write something and not bother to check if it ever made it live.
Each account can only be set to one region. According to the knowledgebase article below, one should be able to change the region on an account. Since this process doesn't seem to have worked properly in your case, I'd suggest contacting iTunes support.
http://support.apple.com/kb/ht1311
However, you could have two iTunes accounts; a UK account and an Irish account. The advantage here is that you don't have to worry about a previous UK purchase not being available in the Irish store.
To get an iTunes account in a country in which you do not reside (and therefore do not have an address or credit card from that country), you could purchase an iTunes gift card from the country in question and follow the instructions in the
How to redeem an iTunes Gift Card on a computer > I do not have an iTunes Store account
section of the following knowledgebase article:
http://support.apple.com/kb/ht1574
You will need to authorize both accounts in the Store menu in iTunes. Once both accounts are authorized, you should be able to update the apps you purchased with your UK account as well as any new apps you purchase with your Irish account.
On your iOS devices, however, you can only be logged in to one iTunes account at a time (Settings app > Store > Apple ID). On the device, over the air, you can only update the apps associated with the currently logged in account.
I hope this is helpful.
Best Answer
Just for anyone else with the same issue. I tried another browser and it worked fine, so it's some kind of browser issue.