English law is the common law legal system governing England and Wales, comprising criminal law and civil law. 

English law has no formal codification: the essence of English common law is that it is made by judges sitting in courts applying statute, and legal precedent ("stare decisis") from previous cases. A decision of the Supreme Court of the United Kingdom, the highest civil appeal court of the United Kingdom, is binding on every other court. 

Some rulings are derived from legislation; others, known as common law, are based on rulings of previous courts. For example, murder is a common law crime rather than one established by an Act of Parliament. Common law can be amended or repealed by Parliament; murder, for example, now carries a mandatory life sentence rather than the death penalty. 

The first schedule of the Interpretation Act 1978, defines the following terms: "British Islands", "England", and "United Kingdom". The use of the term "British Isles" is virtually obsolete in statutes and, when it does appear, it is taken to be synonymous with "British Islands". For interpretation purposes, England includes a number of specified elements: 

"Great Britain" means England, Wales, Scotland, their adjacent territorial waters and the islands of Orkney and Shetland, the Hebrides and, by virtue of the Island of Rockall Act 1972, Rockall. "United Kingdom" means Great Britain and Northern Ireland and their adjacent territorial waters, but not the Isle of Man, nor the Channel Islands, whose independent status was discussed in "Rover International Ltd. v Canon Film Sales Ltd." (1987) 1 WLR 1597 and "Chloride Industrial Batteries Ltd. v F. & W. Freight Ltd." (1989) 1 WLR 823. "British Islands"but not "British Isles"means the United Kingdom, the Isle of Man and the Channel Islands.
What does "Great Britain" mean
"Great Britain" means England, Wales, Scotland,