For about 20 years, bonds were the standard hedge in a retail investor's portfolio because they tended to be negatively correlated against equites. However for widely debated reasons, that inverse relationship between bonds and shares started to go wonky more recently and indeed in the very long run (ie 50+ years) bonds have spent long periods positively correlated which makes them of limited use in de-risking a portfolio.
If you're not expecting to need to access your capital in the next few years a 100% equities portfolio (suitably diversified, of course, by which I mean a basket of trackers spanning several geographical markets) is IMO quite reasonable. Of course, you then have to be prepared to sit tight and never ever sell even when the market goes bonkers for several months and you're maybe looking at a 20%+ drawdown (eg 2007/8). But that's extremely hard for a lot of investors to stomach, and I'm guessing no high-street financial adviser will be prepared to recommend equities-only, so you'd have to be prepared to build your own portfolio using a platform like Hargreaves Lansdown.