You are showing good loyalty to PTSB, perhaps for convenience and the ability to meet a face. No harm in that, many people feel more secure that way, but its loyalty which could be costing you money and I do not believe in loyalty to financial institutions. Re online banks, Northern Rock and RaboDirect - I certainly think they can be trusted as much as any Irish financial institution.
(1) Re PTSB lump sum in 21 day account @ 4%, Anglo Irish Bank offer 4.25% for their 21 day account. Northern Rock on demand is 4.30%. Rabodirect is 5% for the first 10K but comes down to 3.75% after 10K. So there are 3 options worth considering.
(2) Re PTSB regular saver account @ 5%, you can save the same amount, €2000 per month with Anglo Irish Bank @ 7% (joint account). You could do the same with Halifax opening three accounts yourself, spouse and joint,€750 each @ 7%. However both these have strict terms and conditions which may not suit you. You could consider Bank of Ireland with the €2000 per month @ 6.5%. AIB have the best interest rate @ 7.10% but you are limited to €300 per month per person. The terms and conditions with Bank of Ireland are quite flexible and may suit you best. AIB are also quite flexible but you must have a current account. If you haven't, no big deal - just open one. The important thing with all above, especially with regular saver accounts, read the terms and conditions.
(3) You should certainly get that money out of the current account and consider (1) above. Remember the on line banks are on demand - no waiting for 21 days - can be withdrawn straight away.
If I were you I would spread your money around to your best advantage, after all, you have worked hard for it. Hope above of help and good luck