National Savings do something called a Guaranteed Equity Bond - I think it's 5 years fixed with a return of 125% of the FTSE (but if the FTSE crashes over that time you'll get 100% of what you put in). The downside is that you don't get paid dividends.
There are other private schemes but they don't have the same guarantee.
Personally I don't think this is for me, but it's something to look into.
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Consider corporate bonds if you intend to save it for 3 years plus, or FTSE index trackers if you intend to save it for 10 years plus.
I know that's always the advice, but since you can buy and sell index trackers for 0% commission I don't see any problem in having a shorter term view (CGT allowance also considered).