You realise that's just a 1A USB port? It's the same as this except it has the words "Apple iPhone 5" in the title and costs 1.5 times as much:
http://www.ebay.co.uk/itm/BELKIN-12V-DC ... 2740994%26
I didn't want to say anything but I got 2 doubles free with charger leads.
The leads were £3.50 each free packaging
You beat me to it Haydn It is also a good idea not to totally rely on these types of chargers as they can overcharge the battery, if this is done on a regular basis then oxidisation will take place within the battery and shorten battery life. Best practice is to only use these types of charger only when you have to i.e. charge on the mains whenever you can and use this type as a "reserve" or emergency charger. Don't just get in the car and plug the phone in to the charger just because there's a charger in the car.
I didnt realise that the in car chargers can bugger up the battery. Pretty much every time i get in the car i put my phone on charge,as then i know when i get to my destination,that its fully charged up. Is this bad practice then?
It's best to charge on the mains whenever you can, not all in car chargers are poor but it's best to stay with a branded product like Belkin, for example. I would certainly avoid un branded ebay stuff, I was asked to look at a customer's car phone charger, the phone was so hot on charge it was almost uncomfortable to pick up and had been bought on ebay, from China I think.
The benefit of a mains charger that is supplied with the phone by the phone manufacturer is that you know it will charge your phone battery at the correct voltage and current. Lithium ion batteries need to see the correct initial charge before they go into saturation charge, if this doesn't happen regularly (with the wrong charger for example) then battery damage will occur over time and will shorten the life of the battery. With the advent of 18 and 24 month phone contracts now (12 months used to be the norm) it is even more important to look after your phone battery. Hope this helps