According to an e mail I received today
On Nov 30th 2006, the EU refused to renew the various exemptions that tax UK Avgas at 50% of the car petrol rate, and UK Jet A1 at 0%, for private pleasure flying, effective Jan 1 2007. The UK had applied for the exemptions to continue, but was turned down.
This could lead to increases of 30 pence per litre for Avgas and 20 pence per litre for Jet A1, used for private pleasure flying, if the full road fuel tax is imposed.
However the UK government does not have to impose the full road fuel tax. They can choose to impose the EU minimum tax which would see a increase of 2 pence per litre for Avgas, and .02 pence per litre for Jet A1.