What constables from what other islands....?
The arrangement which will be made will be for policemen from unaffected parts of Jamaica (if available after their own problems) or St. Lucia, St. Vincent etc to come in to help restore order. It's better to have a black Caribbean English-speaking cop swinging the bobby stick and cracking heads. The Brits will pay their bills in the short term I expect. But we can send a company of MPs much faster than anyone else, and they need the law and order restored NOW, not next month.