Quote:
Originally Posted by Tannaton
^^^ That's what I was looking for, and is where the petrol can sizes come from :
A portable petrol storage container must—
(a)have a nominal capacity —
(i)no greater than 10 litres if made of plastic; and
(ii)no greater than 20 litres if made of metal;
(b)have a total capacity between 10% and 15% more than the nominal capacity;
(c)be made of either metal or plastic that is suitable and safe for the purpose and will not significantly degrade due to exposure to petrol or naturally occurring ultra-violet radiation;
(d)be designed and constructed so that—
(i)it is reasonably robust and not liable to break under the normal conditions of use;
(ii)the escape of liquid or vapour is prevented;
(iii)petrol can be poured safely from it; and
(iv)it is not unsteady when placed on a flat surface;
(e)be marked or labelled in a legible and indelible form with—
(i)the words “PETROL” and “HIGHLY FLAMMABLE”;
(ii)an appropriate hazard warning sign;
(iii)the nominal capacity in litres; and
(iv)the manufacturer’s name and the date and month of manufacture.
But no mention of how much you can buy?
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You can legally store up to 30 litres, so I would assume you can also buy 30 litres. It would be nonsensical to have to buy lesser amounts at different times up to a maximum of 30 litres.
This would appear to answer the question.
https://www.hse.gov.uk/cdg/commonpro...20be%20applied). As a private individual - I assume in this instance you are - ADR regulations don't apply.