Using the passport of the country which you fled from is very risky, and not a good idea at all.
That's because a refugee using the passport of the country from which the refugee has fled makes a statement that they now accept the authority of the country from which they've fled. This will be seen as abandoning their claim to refugee status.
If the ...
Only if they do not want to pay import duty (and tax) on them when they re-enter the country with them.
The key words are 'may elect'.
When you re-enter a country you can be asked for proof that you had your valuable items before you left that country for travel. Registering is a way to do so. Often proof of sale will also work.
As far as I understand the ...
Check if you fulfill the conditions stated here:
Tax on shopping and services
You can sometimes get VAT refunds on goods bought in the UK if you:
visit the UK but live outside the EU and are going back home
are an EU resident leaving the EU for 12 months or more
are a non-EU resident but work or study in the UK and are ...
I would not anticipate any problems with security upon departing the UK. People travel with those sorts of items all the time, and none of them are listed as prohibited by the UK Civil Aviation Authority, as far as I can tell
When you arrive in South Africa, you will need to declare these goods by going through the red channel, as their value exceeds ZAR ...
In the UK security knows what computer parts are and how they look on the screens. If in doubt they might ask you to unpack an item so they can actually see it.
You should bring these items in your hand luggage, as valuables and breakables should not be packed in your hold luggage. But you seem to have too much for your hand luggage. In that case you will ...