Hi Claudia,
You would do much better to put James' money in a ling term medium equity Prudential unit trust. Both Allan Gray and Investec have good products. Have a look on their websites rather than phoning and speaking to an advisor as otherwise you risk paying added advisory fees. Savings account or a bit of a waste of time. After inflation and interest tax you don't get much out.
I am perso ally anti education policies (or any investment policy that dictates what I do with my savings. Your son may want to be an artist or something and want to money for a flat or a culinary tour around France or something and then you're fekked.
As RM says, from a strictly financial point of view over the short teem it would probably be better to plough the money into your bond (or any other debt) however over the long term a managed balances porfolio has historical always outperformed property and debt savings rates.
Regarding satrix, be careful. This is basically a passive portfolio )I.e. Not managed) that replicates various stock market indices. This means you buy the bad with the good. In our stock market almost 40% is off shore linked. Anglos, Telkom, SAB they all move with international markets. Not really something you necessary want to willynilly place all your savings in. Oartcularly when you look at how poorly international markets did in the last crisis vs. South African markets. You would do much better to put your money in reputable equity, fixes income or balanced funds that are managed by qualified reputable firms and people who know what they are doing and charge a small fee. You can research all available funds and compare fees on
www.equinox.co.za
I have over 10 years of experience in investments and financial markets as well as 6 years of postgrd investment study so yah. I know a bit about what i'm talking about