Note also the comments by Tallbloke's solicitor at WUWT, outlining the legal action that is possible. My guess is that the police may have a problem here:

i) Potential libel claims against Laden and Mann and any others who might be found to have stated, suggested or implied that there was criminality on the part of Tallbloke.

ii) Potential malfeasance by the persons responsible for the obtaining of the Warrant in the form deemed appropriate (but actually wholly inappropriate) and for the heavy handed treatment of Tallbloke who would always have been prepared to assist voluntarily.

iii) Various damages claims under UK law for distress, inconvenience, invasion of privacy and damage to property.

iv) Possible injunctive relief preventing examination, copying, cloning or any unauthorised use of Tallbloke’s private data.

v) Requests for immediate return of Tallbloke’s property and rectification of damage done during the process.

vi) Investigations into the sequence of events that led to this farrago and the identities of the person or persons responsible.

Other possibilities may come to mind in due course.