When I last looked a couple of weeks ago Halifax had the best rates for fixed term ISAs. They were doing 3% for three years but I believe this has now been reduced to 2.25% - absolutely pathetic!
However, they do accept transfers in which means you can transfer the funds from your maturing Lloyds ISA and still be able to use this year's allowance to either top up with the Halifax or open another elsewhere.
One word of warning - DO NOT withdraw the funds yourself and try to transfer them to another provider. If you do you will lose the tax-free status of those funds. You must ask your new provider to arrange for the transfer of funds from Lloyds for you.