False police report and fraudulent insurance claim advice!!!?

if I am able to prove that someone has made a false police report along with a fraudulent insurance claim against me what action can I take? I have sent my insurers a letter informing them that I have no knowledge of any such incident and will be fighting this claim!

My partner was arrested and has answered to bail once only to be re-bailed for allegedly causing an accident with his driving however at the time this occurred he was not in the vicinity and we have receipts to prove this as he was at the vets with our dog is it a positive or negative thing he wasn't charged and re-bailed instead?

The police are still investigating this and last week a new witness to the "incident" came forward after two months and what do you know an insurance claim also goes in along with them telling my insurers there car was damaged (but there is no damage to my car) and the police have stated no damage was caused to this car and why report this after 2 months to me it's suspicious to say the very least any advice would be appreciated...