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Remove the lower radiator hose.

I find that a bit too fast (and messy) myself. I take out the actual drain valve (and I do mean I remove it, which is easy. They often stick and break if you actually attempt to open the valve, which has a tiny, tiny drain tube at its center). That drains the system quickly, but in a more controlled manner.
 
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Being able to drain it fast helps when flushing. I remove the thermostat, detach the bottom hose and flush through the thermostat housing, I also remove both drain plugs in the engine block. Then I disconnect the hoses at the heater tap and flush the heater matrix separately.
 

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However you do it, just make sure you bleed the system properly. I had a heck of a time in my Corniche and if you get air trapped, the temp sensor won't read accurately, no will the aux fans function due to trapped air.
 
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