The heating oil collective now has over 100 members (and is probably near the limit of its total membership). By ordering oil in bulk, this usually achieves oil at prices per litre 3p to 5p cheaper than could be obtained by individuals placing orders independently.

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The minimum order is 500 litres but the price per litre is the same as an order for larger amounts so you don't need your tank to be nearly empty to get a good deal.