While interest rates remain low, returns on fixed rate bonds aren't as high as they used to be, but there are capital protected alternatives and if you are looking to tie money away for 3 years plus, structured deposit plans may be worth considering. These plans have a fixed term and have a return linked to the performance of an underlying asset e.g. the FTSE 100.
Structured deposit plans are appropriate for people who have a low appetite for risk but are willing to accept a return on the deposit that involves some exposure to the stock market. While returns are not normally guaranteed, they do offer the potential for competitive rates of return when compare to fixed term bonds. As structured deposit plans are cash based they are eligible for the Financial Services Compensation Scheme (FSCS) up to £85,000 per person per institution in the same way that savings accounts are.