The only two I know of are a long way from the boot.
First in the roof electrics above the rear view mirror.
Second is in the left hand fuse box. Open the passenger door and it is at the end of the dash. Forget which fuse but be careful, it takes a few seconds to come hot after ignition switch on and also stays hot for a short while after ignition switch off. The horrible thing fooled me for a while.
I have put one of these in the fuse holder:-
http://www.ebay.co.uk/itm/2305022319...%3AMEBIDX%3AIT
Just make sure you put it in the correct way.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)