I have signed up, i also noticed that Richard Hammond from Top Gear is also singing the prarises of this initiative, lot of press on this one, go to the web site and select media, watch the video clip from ITN News, they currently have 250,000 people signed on and are approaching BP to get discounted fuel, it works in the same way as Overdrive or All Star for fleet accounts and they are looking to get a discount of around 10p per litre for card holders.
The question about spam is a definate NO, they will not pass your info to any 3rd party.
The more people sign the bigger the purchasing power with the fuel company, system already operates in Holland so it is tried and tested and no i have no interest in the company other than i want cheaper fuel.