Godfather,
If you are looking for the best return on your lump sum from a bank account, it makes much more sense to use an online account with Rabo or Northern Rock. These banks give you a higher interest rate than Anglo, plus your cash in not locked in.
Rabo give 4.75% on the first 10,000, and I believe 3.7% after that. NR give 4.15% up to Eur 3m. (Check Financial Best Buys thread in case my memory doesn't serve me correctly). These banks also tend to respond to ECB rate increases quite quickly, and will generally pass on at least a portion of the rise.
A recent thread on the reliability/stability of these online banks highlighted the fact that both are in fact several times larger than BoI and AIB, and are thus extremely unlikely to have problems.