If you have old loose fill and asbestos ceiling then remove both since you are doing a major reno with no-one living in the house and it will get rid of that as a problem and make it so much easier and safer for you and everyone else working on the houses now an in future. You save nothing really by leaving the loose-fill and ceiling lining in place and create future potential problems. Loose-fill can be vacuumed up or manually collected and asbestos must be removed as per regs - use masks and proper safety gear in any case.
Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.