In reply to colina:
If he doesn't want to risk it in shares, Peer to Peer hardly seems suitable.
Assorted things, all at different places on the risk reward scale. Decision also impacted by how quickly access to the funds is required.
1. Direct investment in shares unsuitable - volatile, £20k can't be diversified enough, costs etc. It is however pretty immediate to access the cash.
2. Invest in a diversified pooled vehicle. OEIC or Unit Trust. Pick something funky and take higher risk or low risk but lower return. A FTSE tracker would give pretty close to whatever the FTSE returns. Its still shares but instead of having £10k each in 2 companies you get a slice of lots and lots of companies so less single company risk. But you still get market risk (up or down).
3. Invest in a Unit Trust or OEIC that invests in bonds. Generally lower risk than shares but still potentially risky.
Invest in Fixed Term Bonds yourself. Look for the best rate on 1, 2, 3 or 5 year Bond issued by a bank. Money largely tied in for the duration although you can usually get it back at expense of a loss of interest. 5 Year bond might get you 3% gross, less on a net basis. If a non taxpayer you can claim the interest gross. Not a big return but pretty safe and higher than inflation (just). The rates are higher the longer you are willing to commit to but the penalties are also longer... say 30 days interest loss on a 1 year, 60 on a 2, 6 to 9 months on a 5 year (figs off top of head and will vary)... so although you can access your cash, if you decided to get it back in month 2 of a 5 year bond you would get less back than invested.
4. Premium Bonds... safe as houses... yield is I think 1 or 1.5% tax free. But that's average... so you expect to get less but might get more. Not really a way to build capital but if you want safe.... On £20k you would probably average one or two £25 prizes per month but may average a lot less or get nothing or get a decent win. Possibly. Odds are however low on a big win.
5. Commodity funds, property funds etc all possible but tend to have higher fees attached and can be very volatile and subject to big global economic risks. Look at what Oil and Gold prices have done etc. If you get lucky and buy a resources fund at the end of a bust and follow it for a year or two up the recovery you could do very well, but timing that is nigh on impossible to average punter. Most professionals can't do it consistently no matter what they think or say!
Post edited at 08:07