I've been moving some cash about. I don't want to lock things away, because rates might change, or I might want to spend some or something.
Found a strange account at
First Direct.
It doesn't often come up in the "Best of" lists because it's not "Easy Access", and for a fixed rate it's not the very highest.
The odd thing is that you can have several accounts. Closing them costs a flat £100, no loss of interest.
Normally you expect to lose 90 days', if it's possible to take the money out at all.
If you have say 40k in one, closing it loses you less than 3 weeks interest, and pro rata.
So I'll have a few with ratios of 1,2,3,4 or 1,2,2,4,8,12, or something. You'd close the largest which suited the amount you wanted out.
About the best for Isas I found is Virgin Money, 2 years /90 days loss of interest on early withdrawal.
An andvantage for you of holding a long fiixed non-isa rate is that you get to keep that rate if rates fall, but it can be criticial to your tax, too,
if earnings say this year push you across a tax threshold. If you defer the availability of the interest to when rates are lower, you'll have less comng in now, from other accounts.
The other thing you can do on that is buy stocks which pay good dividends. Mine bought for the purpose have yielded several percent, which is taxed separately from other income, and at lower rate. (Allowance is dropping, watch it).
I went through all this for a mate, who's retired and got himself stuck.