According to documents obtained by the BBC, senior officers were concerned Mountbatten-Windsor could argue the house was not his property. This would have required police to seek separate legal permission to enter, creating a delay the force believed could jeopardise the integrity of evidence.
The background to Mountbatten-Windsor's arrest, which occurred on 19 February, has emerged as police asked a judge for warrants to raid the former prince's homes. Lawyers for Mountbatten-Windsor successfully argued those warrants were unlawful in court last week.
Mountbatten-Windsor's arrest came after the US Department of Justice published material that showed his connections to the convicted sex offender Jeffrey Epstein. The investigation into Mountbatten-Windsor remains ongoing. He has denied any wrongdoing in relation to Epstein. The BBC has approached his representatives for comment.