How do you manage it? Do you have a spread sheet cos you'd need to know what was where, when you can add or withdraw from each, penalties, when the rate changes so you need to rethink etc! ARE you constantly moving it around?
We have a house sale lump sum and daren't risk it all in one account (and need to earn SOME interest on it thus Northern Rock's 100% guarantee, being at 2% is barely worth it!). I have to set up these 4 accounts, or at least 3 more next week when the sale money arrives.