How can an organisation with no grounds to claim you are breaking the law obtain a warrant to search your house?
They can’t gain a warrant if they have “no grounds”
They have to convince a magistrate that there are “reasonable grounds for believing”
They may be incorrect, but that doesn’t mean they don’t have reasonable grounds.
(1)If a justice of the peace, a sheriff in Scotland or a lay magistrate in Northern Ireland is satisfied by information on oath that there are reasonable grounds for believing—
(a)that an offence under section 363 has been or is being committed,
(b)that evidence of the commission of the offence is likely to be on premises specified in the information, or in a vehicle so specified, and
(c)that one or more of the conditions set out in subsection (3) is satisfied,
he may grant a warrant under this section.