It takes time, a lot of time, so be patient.
Personal relationships are key, take your time to build them (more likely than not, you will have to come over for meetings).
Focus on a market (even if just a neighbourhood of a particular city, a place like Sao Paolo has 20 million people!).
Study your markets: can you really sell there at a profit? Why would consumers buy your products and not what’s there already?
Not many supermarkets buy direct, they often prefer buying via a distributor.
Ecommerce is not as developed as in the UK/US.
Social media is very powerful across Latin America.
Not everyone here speaks English, so you will need at least some materials (and probably some labelling) translated into Spanish or Portuguese (Brazil).
Think outside the box: how about free trade zones, duty free shops or how about sourcing ingredients from Latin America so that you have an extra story to tell? How about using a UK-based consolidator instead?