The error is due to a SYSTEM_THREAD_EXCEPTION_NOT_HANDLED and the first parameter 0xC0000005: STATUS_ACCESS_VIOLATION indicates a memory access violation occurred.
So I'll do as before and post updates if I figure this issue out.
NOTE: Dell are replacing the motherboard in my laptop in the next week or so. My laptop is one which the battery discharges while while plugged in to the charger when running . Motherboard spares will be in stock in the UK on the 26th August so perhaps this will resolve this issue.
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@MSS88, Mike - I haven't had a recurrence of the issue since the motherboard was replaced. I have had one bluescreen since then due to a kernel crash ks.sys but didn't have time to analyze.
Issues following motherboard replacement: all of the dell apps were lost from the MS store and so presumably would not have received updates through that channel. So, I chose to reinstall everything from recovery. I discovered that the motherboard replacement also trashes the onboard recovery tools - BIOS Connect and SupportAssist OS Recovery - it can no longer connect to the NICs from the onboard BIOS and the onboard recovery just crashes out and reboots the laptop.
Dell sent me a USB with the recovery tool on it and say they can't fix the recovery options but honestly my time is too valuable to pursue it. I'll just live with USB recovery instead.