I recently had to buy some new 5litre or thought plastic fuel containers (old one necks had split ) thought they wer 5 litres ,filled them could only get 4 litres in them ,assistant in garage couldnt work it out ,I rang manufacturers ,,,wait for it new legislation only a allowed maximum of 20 litres in 5 cans so made cans with thicker walls,I said but 20 litres in 4 5 litre cans is easier to transport and 5 litres easier to mix 2 stroke,got a lecture on 2 stroke machinery is outlawed (2 stroke Victa mowers coming back into use by me)also said need a training course on how to mix hazardous products together,I gave him my COSHH LEPRAC HSE Legislation details then told the guy very politely where to shove his advice jezza