Aldermore do a 5 year fixed rate bond that pays interest monthly and is currently paying at 5.4% which might be the sort of thing you are after - think it is a £50k max though (edit: completely wrong about that it's £1m!). http://www.aldermore.co.uk/savings/fixed-rate.aspx
The AA do a 2 year fix at 4.35% http://www.theaa.com/savings/fixed-rate-savings-accounts-products.html
Relying on savings for income has been tough for the last few months.