Hello, dinosglasgowltd.
When you cancel your QBO subscription, you'll receive an email notification to confirm the cancelation. It means there is no grace period once you cancel your subscription.
Also, once you cancel your QBO plan, you have read-only access to your company data for a year. To know more about it, please refer to this article: What happens to my QuickBooks Online data after I cancel?. It contains details about data availability and export policies after cancellation.
However, before you cancel, we may be able to find a solution that fits your needs. Contact us for a discussion about your account options for free (from a mobile or landline) on 0808 168 4280.
We hope you'll consider QuickBooks again in your future endeavors. You're still welcome to post here if you have any other concerns with your subscription or data. Stay safe!