The queen can veto bills and she has done so before. The queen has to sign every bill for it to become law. A joke? I don’t know. They have had a monarchy for about 1,000 years and as you know, the sun never set on its empire. Not too shabby of a history. It has worked for them. She is not just merely head of state, the monarchy does have a purpose and power, although most of the power is not exercised.
She can only veto bills on the advice of her prime minister and she has never done so. Lasttime it happened was in 1708 when Queen Anne vetoed a Scottish militia bill on the advice of hr ministers. The Queen will do whatver Boris instructs her to. It is the Prime Minister who excercises the Queens powers and the Royal Prerogative. The Queen is an expert on the British constitution and will give her PM the benefit of her expertise. It is, paradoxically, the Queen who will advise, and the Prime Minister who makes the decision.