BP and the Ethanol scam

A while back BP introduced a fuel called E10 - its 10% ethanol and its always about 4c a litre cheaper. Problem is that I have never been able to buy it. Every BP I go to is out of stock. I have a feeling thats its not due to popularity, but due to them wanting to look like doing their bit, but then forcing you to buy unleaded instead. Bastards !!!!