Cameroonian farmers need protecting from free trade with the EU, and Britain has recently pledged investment into 3 African economies. In times of Brexit, the UK is re thinking trade with the world. So recently, have pledged large sums to Africa after exiting from the European Union. https://www.bbc.co.uk/news/uk-politics-45325701 Into RSA (Republic of South Africa), Kenya and Nigeria to be precise. If somebody is dumping onto any of these markets/economies my country has pledged a lot of money to (the EU's doing it to Cameroon's) then I'd want my country/The UK the stick up for these locals my country has invested into. Because we already have made in China, made in Vietnam, made in Sri Lanka and made in Bangladesh, how about making Africa give Asia a run for its money?
The idea of Britain "stick[ing] up for these locals" in African economies could be seen as funny. I'm not going to laugh mind you, given the ugly truth of our part in maintaining African exploitation.
If trade with the EU is devastating developing economies by dumping on to them and pricing the locals out, and the UK has pledged UK's money to boost 3 different African economies, then, to protect the investment, UK should (I think) protect the economies/the investment into these economies - against unfair trade with the EU.
It seems to me, you can have free trade, or you can have fair trade, but you can't have both? (I guess/IDK).
The impact of EU on developing country trade is not clear cut. Its agricultural policy, for example, boosts some countries. There are issues with how the EU has corrupted multilateralism (with a shift away from a rules based system based on development ensuring the harming of sub-Saharan Africa). The UK leaving the EU, however, will only further inflame that problem.