m15 R2, anyone running Docker for Windows?

I have a new Alienware laptop (m15 R2) that I want to run Docker for Windows on. I believe I have everything set up correctly, but Docker for Windows reports start up failures (effectively because the VM doesn't start - see below).

A couple of days of Googling this issue and trying various solutions has not fixed this error.

This is the error that Docker reports. The key characteristic is that attempts to start the VM fail, but the reason for the failure is not explicitly stated. You can also see the same problem trying to start the image in Hyper-V Manager.

NB this laptop doesn't appear to have a BIOS option for VTx. However, I can enable Hyper-V in Windows features and Virtualisation is enabled according to the Windows 10 task manager. 

Unable to start - The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: 'DockerDesktopVM' failed to start. (Virtual machine ID 434B5A1D-340D-4701-8B5A-B3CC3CC353A6)

at Docker.Core.Pipe.NamedPipeClient.d__5.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

at Docker.Core.Pipe.NamedPipeClient.Send(String action, Object[] parameters)

at Docker.Actions.DoStart(SynchronizationContext syncCtx, Boolean showWelcomeWindow, Boolean executeAfterStartCleanup)

at Docker.Actions.<>c__DisplayClass24_0.b__0()

at Docker.ApiServices.TaskQueuing.TaskQueue.<>c__DisplayClass17_0.<.ctor>b__1()