[link=http://www.modelsinmotion.co.uk/category.asp?catcode=261&tamiya=258]Models In Motion[/link] (NOTE: This is not their full stock, e-mail them for a full list of all their fuel.)
[link=http://www.modelsport.co.uk/?CallFunction=Category&CategoryID=4030]ModelSport[/link] (Although, they have a bigger stock, you have to pay P&P on all you orders, whereas on ModelsInMotion it is free on orders over £15.)