Cash ISAs - to fix or not?

[onedsla]

Hello,
I'm curious to know what others are planning with existing cash ISA savings.

I have about £50k accumulated over the years which are currently only getting 2.5% interest; I didn't anticipate the base rate staying so low for this long and expected better returns to be available before now.

I have no plans to use this money but my preference is to keep it as a cash isa.

I'm considering the following options:
Instant access: 3% (and see what becomes available through 2011)
2 year fix 3.5%
3 year fix 4%
4 year fix 4.3%

So is the perceived wisdom to fix now (and if so for how long) or to wait and see?
Appreciate your thoughts.

[Norfolkinchance]

I think instant at 3% would be smart. Rates aren't going any lower and hints about increases are more common recently.

[condor]

I'm transferring my previous years ISA to the 3% offerring next week ( as my 3.5% rate ends Tues). Using this year's allowance elsewhere that offers a minimum variable rate of 3.15% but doesn't allow transfers.

[northandy]

I would go for the 3% instant now, then sit tight.

An extra 1% for committing to 3 or 4 years is pretty poor, I think we will start to see rates rising in q3 this year, the interest rate committee are starting to see votes to increase (iirc 3 of the members last month voted for a rise)