What happens after Andrew Mountbatten-Windsor's win on raid warrants?

UK police have admitted the warrants used to search Andrew Mountbatten-Windsor's homes in February were unlawful, and the High Court has quashed them.
Andrew Mountbatten-Windsor was arrested on 19 February on suspicion of misconduct in public office, and has been investigated over his links to the late sex offender Jeffrey Epstein.
A solicitor says the setback does not necessarily jeopardise the broader investigation, so what happens to the evidence police gathered?