...ISA.how do I choose best ISA? I would like to know which cash ISA will offer me the best accumulated interest in 12months time if I invest £3600 this April. I already have two cash ISAs which I understand I can transfer into the cash ISA I open up in April as well as the £3600 I wish to use to open this( in effect I will then have £10800 in one cash ISA).My bank is offering me a one year fixed interest rate of 3%,am I likely to be able to do better than this for a 12month period.Advice will be gratefully received