An easier way is to find a sacrificial 8mm allen key and cut a ~20mm bit off, put it into the drain plug, and use an appropriately-sized spanner to undo it.
But MAKE SURE YOU GET THE FILLER PLUG UNDONE FIRST!
Also, buy two new plugs. Mine were a bit mullered by the time I'd managed to get the drain one undone. Ford part number 6732263 x 2.
that is a good idea, probably a lot easier than then method i used I did also make sure the filler was not jammed before taking out the lower plug. Filler on mine was very easy to undo, plug not so much, mashed my hex bit.