Belize
I would put Belizean hot pepper sauce on the list for Belize because it is the kind of thing that feels useful once you are home, not just another airport purchase. The best version is usually the sealed jar, tin or packet from a normal supermarket, spice stall or food hall, not the most expensive tourist version. The reason it works is that it gives you a quick reminder of the trip without needing to keep a fragile ornament safe forever.
Belize
When I think of an easy, crowd-pleasing thing to bring back from Belize, Belize rum is a good pick because it does not need much explanation when you hand it over. For alcohol, I would only bring this back if it is sealed properly and comfortably within the UK allowance; otherwise it is better as a UK-buy link. I would rate it higher when it is locally made, clearly labelled and easy to use at home, and lower when it is just tourist packaging.
Belize
Belizean carrot-based habanero sauce with bright chilli flavour.
Belize
Cacao nibs or chocolate from Belize’s cacao-growing regions.
Belize
Woven palm basket is worth adding because it feels like something you actually noticed while travelling through Belize, rather than a generic souvenir. The trick is to choose the simple, well-made version. Small craft items look better on a shelf when they are not too shiny or mass-produced. The ideal version is modestly priced, not too bulky, and good enough that you would buy it again even without the holiday memory.