If you are a manufacturer or wholesaler and need goods shipping to Guyana, shipping to St. Vincent, or shipping to any other of the Caribbean islands, you will need to investigate companies that are specialists in shipping to the Caribbean. There are, indeed, companies that do specialise in shipping to the various Caribbean islands, and they will have the kind of experience that you need in order to ensure that your goods arrive safely and equally importantly in a timely manner.
After all, when you have customers in these far-flung places, they will want to know that not only are your goods of top quality, but that they will also arrive when they are supposed to so that they don't run out of stock and then lose business because their customers cannot rely on them. Their customers won't blame you, the manufacturer or wholesaler, they will blame their own local supplier, even though it is not his fault.
In one sense they could even be right because it could be argued that their supplier should know better than to import goods from abroad when the seller cannot be trusted to deliver on time. Certainly, there can be an occasion when things are beyond your control, or that of your shipping company, such as severe weather conditions, or a local uprising, but by and large you need to ensure that you are using a shipping company which is reliable and has the local knowledge required to get your goods from the UK to your end customer without any problem.