What degree of risk are you prepared to take?
What degree of liquidity do you require, and over what period?
I'd suggest (unless you already have) first maxing out any investments given government incentives in terms of tax-efficiency, such as ISAs, etc.,
After that, much depends on the level of risk you find acceptable, and the duration of investment you seek and the level of accessibility you need to the money. Individual shares can be a good bet, and are relatively liquid, but even blue-chip investments aren't always a good bet. Look at the trading history of BT.
Funds specialising in, for example, Russian telecomms have been phenomenally good bets in recent years ..... but are the options still as good.? And you run the risk of not just having the value drop, but losing the whole lot. If you go for any fund, high risk or not, don't forget to check out what you pay in up-front fees, and on-going management charges. A fund with a large up-front fee is, all other things being equal, obviously a better bet for a medium/long term investment than a short-term one.
Property has strong advantages, but it is not as easy as the TV would have you believe, and nor are returns necessarily either good, or guaranteed. Buy to let is fine, provided you can actually let at a rate that pays returns adequate to cover fees and taxes and still provide the return you need, can pick the right property in the right place at the right time and pay the right price for it, and have both the time and ability to either deal with day-to-day issues that arise, or afford management fees to do it for you.
There are no easy options. If there were, everyone would be at it. Anything you do will have returns on the one hand, with level of risk and both ease and speed of access on the other. If you're prepared to entertain high risk, or commit money for longer periods, returns will go up.
It all depends on your needs, and willingness to commit and take risk. and nobody can decide those for you.
As for gold, it's highly speculative. It is likely to always retain a degree of inherent value and is relatively easy to transport. It has its place, but as a pure investment? Be VERY careful, if you don't plan on tracking the market very closely indeed.