buying tickets for uk events from Ireland

yes, you can. I ordered for the Eminem Bangor show from there. You might need a new account (but you also might be able to temporarily chose .co.uk as your "home" domain extension).

It gave me this when logging in with the "irish" credentials:

You have logged in from a domain that is not the home domain in your account.
Your home domain is http://www.ticketmaster.ie
To edit your home domain, please change your location in your User Profile.
You can still access and manage your account using the My Account navigation to the right.
Login to your account from your home domain to take full advantage of your personalised My Ticketmaster features.

I don't remember seeing that message this when I ordered. Might be new. Anyway, current account or separate one. It should be possible.

If not, here's some alternatives:
http://www.festivaldatabase.com/?cat=2809

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EDIT: just saw that the Wembley event is listed on the .IE site, so no need to bother with the .UK site. You will be able to buy them as usual through the irish site.

It's doable, but the cost of sending the tickets to Ireland is massively prohibitive. I think they were trying to charge 14 sterling punts to send tickets to Ireland.

There wasn't an otion for an e-ticket... I think! Anyway, I had it sent to a UK address, so it was all good in the end.