Padraig - yes, it's a bummer. I don't quite understand why this problem hasn't been addressed by Sony, but you don't need to worry . The only things you're losing out on is, first, the Reader Store - which, after all, is what it says , a store. Users have found no advantages over others, and prices are not particularly keen, and choice, as yet, is limited.
The second is wifi, which, if you think about it, is only useful if you need to buy a book NOW. I rarely am that desperate..... (The browser I suppose is possibly useful, but I find it really non-user friendly in operation, not precise, and difficult to read in most lights - well mine is, anyway.
Given the position of Sony with Eire sales of their goods, you need a different strategy.
If, like a lot of us, you like the Sony hardware, and dislike the Amazon market model/position, I think - and I'm happy to be corrected if I'm wrong, and to be told that Sony owners in Eire have the same facilities in some way I don't know about - your best course of action is to install the excellent Calibre ebook management system, which is the best system there is for general and specialist ereading needs - and all makes of readers. It is free, secure, and the work of a dedicated team of experts.
You can then buy your books/get them from who you like online, into the Calibre Library, then into the T1 - it is a perfect fit for the T1. Google Calibre to find out more.
Then also sign up to MobileRead Forum, again free and secure, truly global, and run by enthusiasts, many professionals with terrific tech no-how, There you'll find others in your position, and sources/resources, expert help & advice/ a huge library. formatted by members, etc...
Both these will help you enjoy your Sony T1 as you have a right to expect - although I sorry I can't help over the wifi/Reader siuation.
Good luck, and I hope this helps.