Re: state savings vs Ulster Bank shorter term deposits, here is a compound interest calculator that is useful for predicting what you
might earn from a 1 year fixed term deposit if you reinvest it for 2, 3, 4 etc years. That's assuming rates and DIRT stay the same - which are pretty big assumptions.
http://www.moneychimp.com/calculator/compound_interest_calculator.htm
Let's say you have 10,000 to invest. UB's 1 year account pays 3.75% gross. If you open this account and after 1 year reinvest at the same rate and same DIRT for another year, after year 2 you'll have 10,532.92
If you buy a State Savings bond with your 10,000 and encash it early after year 2 you'll have 10,520. Slightly less than the UB but it is guaranteed unlike the UB return which is subject to the assumptions I described above.