Additional 12V Ports

Im off to Europe in September. Last time we went we spent a FORUNE on food and drink at service stations, only to find it was 10000x cheaper from local supermarkets (lesson learnt)

Im after one of these for the boot of the 200....http://www.halfords.com/webapp/wcs/...uctId_785253_langId_-1_categoryId_165657#tab3

It runs off 12v, and the reviews are awesome AND its £25 off atm so now is the time to get one.

But what i need is a port in the boot like the Audi's/BMWs have so i havent got cables running all over the place.

Any ideas?

How do i go about wiring it up? Will wiring another to the existing one result in overloading the cables? If so...direct feed required?
 
I have one similar to the one that Arran recommended, only it has two 12v sockets and I got it in Halfords (its Ripspeed branded) . Had it about 10 years and it still works perfectly.
 
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