YeOldeTrout the various trading arrangements / deals / agreements between Africa and the EU is an interesting and complicated area. On the face of it, it looks like fair enough perhaps but there is an undercurrent when you look a bit closer that is protectionist and only of any real benefit to the EU - does it really benefit Africa, and is it really fair trade? ...so the EU saying 'we will reduce tariffs for you on various things if you open up your markets to our products and we will help you with infrastructure with various 'funds' aren't we altruistic - a gift from us :)'.
But is it really helpful? Does requiring Africa to open up to subsidised markets from the EU help them - is it fair? Buy our cheap subsidised sugar - to use your example, and their are many more examples - you can then have access to our single market, but there is a cost - we will actually put your sugar farmers out of business, both in terms of domestic and international markets because you can't actually compete with our subsidised sugar - but don't worry we will give you money to build your roads. That is completely topsy turvy and only serves to keep Africa in 'internationally aided poverty'. Africa doesn't win here - they buy in cheap subsidised products instead of encouraging their own industries and markets. They absorb the cost of such a rubbish deal in order to make at least some money which is, in actuality, losing the money that is rightfully theirs. And who benefits? The EU.
The African countries that refuse to be part of these trade agreements and aid programmes - and there are a few that have/have tried although the pressure is huge - then get slapped with much higher tariffs and are restricted in terms of their access to EU markets. It is a lose lose situation for them.
When we get out of the EU, we can work towards better, fairer trade deals with countries in Africa that respect their autonomy as growing markets and economies. Or we can at least vote in a government that will. We are a big consumer of imports and we know how to export - we can work out a way of trading fairly with Africa that benefits both of us.
All of this can be read about in great detail at your leisure without me having to explain it all I'm sure.
In terms of 'what I like about Brexit' - I like the prospect of our country not being part of this. It is morally and ethically pretty gross.