@leanies_kitchen- 

If you are using QBO SS, you pay the discounted price for 6 months. Once it is over, you have to pay the regular rate (i.e GBP 12 exclude tax).

https://quickbooks.grsm.io/UK

You may utilize a 3rd party tool to migrate data between QBO accounts to keep your monthly cost lower.

 https://transactionpro.grsm.io/qbo