Yes, there is Boiler Juice over here to get a competitive price, or we have Cheaperoil.com in N.Ireland.
A lot of people still will do the searching themselves and ring at least one or two companies for best price of Kerosine. It is a bit like car insurance, - if you don't ask for cheaper price, you pay too much.
But obviously the easiest way is to look online for price and use that price against any other company. Normally only a few pounds of difference though.
I am wary of the possibility of fraud with less Kerosine being delivered, so nice to get someone you can trust.