Do you have any online saving accounts? PostOffice do a decent one that's 3.01% Gross (pre tax) so probs 2.7ish net (post tax), acts like a current account so accessible 365/24/7, no penalties on withdrawals and an option for monthly interest (interest on top of interest).
BankAccounts
PostOfficeOnlineSaver
Make sure you look for penalties on withdrawals on any online saver because they can offer 0.3% more but your money is locked up pretty much.
I would keep your money as fluid as you can for when the time comes (wouldn't hold your breath) when interest rates pick up and the economy starts growing, or contracts a ton and starts growing again, if you're a tax payer then go for the ISA, but there are better options around, if you end up having excess cash then cap an ISA for sure. GL in the future, Paul.
--EDIT The account with the PostOffice is also covered by the governments 85k per individual protection scheme.