I was reading money saving expert.com and I came across a thread about a group who are trying to get better fuel prices. The idea is the same as companys fuel cards because the card company bulk buy fuel and therefore get a discount.
Take a look at the site and see what you think, i have signed up and it has had media coverage on BBC radio and the national press etc
http://www.pipelinecard.org
Before anyone says it, the site is nothing to do with me but I do believe its a great idea and would be nice to see it meet its target so the scheme can take off.