I had enabled SFTP on my blob storage in a personal subscription, not realising the costings: SFTP support for Azure Blob Storage – Azure Storage | Microsoft Learn

At the time of writing this post, it is £0.24 per hour just to have the SFTP enabled on the blob storage.  This equates to £40.32 per week, even if left redundant.

Pricing here: Azure Blob Storage pricing | Microsoft Azure

If you have the option to enable/disable the SFTP option the you can run the following Powershell (the example is to disable SFTP) or use the Azure Portal:

Set-AzStorageAccount -ResourceGroupName "comp-rg-ukw-t-shared-st-01" -Name "compstukwtshared01" -EnableSftp $false