Wilf - thanks for the quick reply!
I have seen mention of the refill rates of the larger manual valve internals to the more restrictive electric valve, but here's the only mention I could find of it on Canton's own website :
"Note: The refill rates on the electric valves are suitable and recommended for Street and Drag Strip use. On Circle Track and Road Course applications where quick refill rates are required, we recommend the manual valve listed below."
So, street and drag strip use (only requiring the occasional refill) are fine with the electric valve.
If I mount the Accusump in the boot / trunk, everyone around my home will accuse me of running NOS. How little they know!!!
Now, another question....

If you don't prelube your motor when it's hot, when do you turn the valve on/off? As far as I see it, if you leave the valve open the Accusump will dump all 3 litres of
oil into your motor as soon as you shut the motor down (because it has seen a pressure drop). Without the motor running to refill the Accusump, those 3 litres will just sit in the
oil pan until the motor has restarted and there's enough engine
oil pressure to fill the Accusump back up. In this case, you're still filling the Accusump with a "new" 3 litres of hot oil, but without the benefit of the pre-lubing.
I haven't even started on my other questions yet.... Maybe I should just fit the damn thing and stop thinking about it!!!
Thanks again,
Craig