The Grumble children get stopped and searched from time to time. They don't seem to mind. They have been brought up in the brave New Labour world. Dr Grumble does not like it. It's just not British. And it's a waste of tax payers' money. As this law is being used it is plainly no way to catch terrorists.
If you want to know your rights you can read them here. You will find that they are somewhat limited.