Thank's I'll have a look.
What are the main problems to look out for with these things and how to fix them?
As mentioned above, there is a thread on it somewhere.
The wiring/switch/fuse problem is because the Chinese have confusion and a quality control issue over supplying different geographic regions.
The US and Australian outlets have the Live and Neutral reversed. This could mean depending on who wired it they could have made a mistake or not known better and supplied it as fused and switched neutral instead of Live.
The earth wires to the metal chassis have been found not up to standard, some make poor contact, so this requires inspection and testing. Might need a new lug, might need a new bolt/nuts/washers, might need sanding some paint to make good contact, that kind of thing.
Most people would be oblivious to this but those who know better check.