Microsoft.Xrm.Data.PowerShell Parameter to update Format

Hi, can someone please advise which parameter to be supplied to cmdlet "Set-CrmSystemSettings" to change the format to English (United Kingdom) ?

I have installed the modules as suggested on seanmcne/Microsoft.Xrm.Data.PowerShell: This module uses the CRM connection from Microsoft.Xrm.Tooling.CrmConnector.Powershell and provides common functions to create, delete, query, and update data as well as functions for common tasks such as publishing, and manipulating System & CRM User Settings, etc. The module should function for both Dynamics CRM Online and On-Premise environment. (github.com)

I am able to update most of the system settings

e.g. Set-CrmSystemSettings -conn $conn -ACTDeliveryMethod 1

but cannot find anything that will allow me to change the format - even tried Get-Help Set-CrmSystemSettings  -Detailed

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I need to do this via the Shell so I can automate the setup.