http://www.modelsport.co.uk/overlander-rc6-vsp-80watt-7a-output-ac-dc-charger/rc-car-products/379060
I would advise you buy this one instead of that one. I have it and works just fine, I have only heard bad things about the touch screen one.
Although if there is something else that you want to buy from modelsport with your vouchers it might be worth looking at hobbyking for a charger as it will probably only equate to something in the region of