The 18th Issue GEB from NS&I offers limited returns for the risks of seeing no gains. I wouldn’t go near it.
National-Savings
The safest place to hold your money in the short-term is in cash. Sounds obvious, but cash is money. Shares, property, bonds, gold and pension funds are all assets whose value constantly fluctuates according to the whims of their markets. You can only be certain what such assets are worth when you come to sell [...]