@Raelene13. Hi Raelene. I dont know of a specific insurer but Terri Sheer does operate in the Landlord and Holiday Let space so maybe try them, if you havent already, especially as living there means there should be no vacancy risk?
Also you do know that renting part of your home makes it partly taxable so ask a good accountant so you know impact and what to claim.
Hope this helps.