Unfortunately the UK no longer has a guaranteed price advantage over us here in SA, and of course their VAT is higher than ours. I found last month that even Incredible Deception offered better prices on a netbook I wanted than the UK!
Where you should definitely NOT buy is from the leading high-street and online operators like PCWorld and Currys/Dixons.
If you are physically heading to the UK and will be buying over the counter, several centres have the equivalent of our Cash Converters but with the difference that in addition to secondhand goods, they also have excellent bargains in closeout stock they may have bought in. For example, last month in the Maidstone (Kent) pedestrian mall I bought a sealed, brand-new SanDisk 16GB flash drive for just GBP 16, or around R210.
Not sure if they have a website, but for absolute rock-bottom deals you can try the fortnightly magazine MicroMart, only usually available from larger newsagents -- they always have cheap deals from smaller retailers and online traders. And in London there's Morgans (they also have a website you could Google) who do cheap closeout stock if you don't mind buying something six months or more behind the times.
