It depends on what part of the Caribbean. See the related links.
If you mean the international dialling code - it is 44
The dialling code 0131 is used in Edinburgh, Scotland - not in England.
00 353
First dial 00 353 56 and then the local number.
The US dialling code from anywhere outside the US is +1
The international dialling code for Ireland is 353 and for the UK (which includes England) it is 44.
Luton's dialling code is 01582.
Remove the leading zero of the English number, then prefix it with the code +44 or 011-44
00 is a commonly used prefix for international calls, but it is not part of the dialling code, per se. Country code +1 is North America (USA, Canada, and some nearby islands, mostly in the Caribbean), and 518 is an area code for the vicinity of Albany, New York.
567218 is not a dialling code from the UK, which all start with zero. The dialling code for Glasgow, Scotland is 0141.
The international dialling code for mainline China is +86
Area code 020 is London, including the old "inner London" and "outer London" areas.