The European Commission is taking the UK government to court because it
… does not require fuel distributors to have two separate fuel tanks to distinguish between the lower tax marked fuel and the fuel subject to the standard rate.
As a result, owners of pleasure craft sometimes (poor dears) find themselves with no choice but to buy red diesel and they may not pay the right amount of tax, which is no doubt a cause of great sadness to them.
As I (and the Irish Examiner) reported some time ago, the Commission is also coming after Ireland’s ludicrous arrangement. Ireland was to respond to the Reasoned Opinion by 16 June 2014; the Revenue Commissioners have not told me how (or indeed whether) they responded.