The UK Visas web site will give you all the required information.
To drive in Britain you will need a valid full driving license issued in a European Community/European Economic area or a valid, full national license issued in your country Caribbean Real Estate
In UK cars are driven on the left side of the road. Overtake from the right. At a roundabout give way to traffic approaching from the right. Observe all traffic signals and road signs. Give way to emergency services vehicles. In residential areas do not use the horn between 23:30 to 07:00 hours. Do not drive in the bus lanes during restricted hours; check timings. Do not use a mobile phone while driving; pull over, stop and then use the phone. Driver and front seat passenger must use seat belts. The minimum driving age is 17.
Parking in Britain is a complicated affair; do spend time to understand the system as fines can be pretty expensive. Hiring a car is a great way to travel around Britain at your own pace. The average minimum car hire age is 23 and the average maximum age is 70, car hire rates may vary with the age of the driver.