Another of the random products I ended up making, mainly as I hated the ones that you find to print yourselves - they use loads of ink and so I put these together in a booklet and got them professionally printed on high quality paper. They have that shine to them that real candy labels have and are designed to fit some of the popular UK chocolate bars. Of course they will fit different brand bars of the same size (or close to the same size).  With some tin foil and some common sense  trial-and-error, you can make these fit lots of different bars.  
 
Each page specifies what bar it was made for. I used the following bars as measurement templates:
Mars 51g
Aero 36g 
Yorkie 44g
KitKat 4 stick 41.5h
Munchies! (I didn't write down the weight, sorry)
and lastly those Cadbury's large-ish bars around 120g - they come in many types: Dime, Orea, etc. As they are all the same size, they should all fit.
 
Kept the price as low as possible, but retained the high quality - I think I found a good balance!