Laws in the UK are formulated by senior members of the government, usually elected members of parliament. These laws must be passed by both the House of Commons and by the upper chamber of parliament called the House of Lords, made up of mostly appointed members given honorary titles and honours because of their service to the country, where no party has a majority. Once both Houses pass a bill or if the House of Commons uses the Parliament Act to ignore the House of Lords' recommendations, it then has to go to the Queen for reading and signing. No bill can become a law of the land until the Queen has allowed it by royal charter and signing it.
So, in theory, she could veto a law if she needed to, but this would likely lead to her own forced abdication by the government or even the abolition of the monarchy. More likely, if she encounters a bill or action of the government that she feels is unconstitutional the Queen will do as her grandfather King George V did over the passage of the Parliament Act and allow the act only if a second general election is held and won by the government on the basis of the proposed act.
Nevertheless, Her Majesty frequently questions laws, is a very astute lady and always has her finger firmly on the pulse of what makes the UK tick.
Note from a pedant
Queen Elizabeth II is not the "Queen of England", this title has not existed for over 300 years. She is Queen of The United Kingdom of Great Britain and Northern Ireland.
Which Queen? There are a lot of Queens. In the UK no bill can become law without royal assent so I'd say her veto power is pretty serious. However, the Queen rarely uses that veto power.
No
veto
The president can choose to veto a law.
By debate in the House of Commons and the House of Lords. Laws then have to have 'Royal Assent' (signed by the Queen) but this is only a formality as she has no power to veto the law.
Pocket veto
its not a law and will not a law
Congress cannot veto a law. Any law must be written and passed by Congress in the first place. The president can then veto it. Congress can override the veto with a 2/3 majority. After a law is passed, the Supreme Court can strike it down if they declare the law unconstitutional.
To strike down a law means that a court has ruled that the law is unconstitutional or invalid, and therefore unenforceable. This can happen if the law violates rights or principles guaranteed by a country's constitution.
His power of the veto, and the power he wields at the (supposed) head of his political party.
the president
Sign it, veto it, do a pocket veto.