No, but you can cancel your order by clicking My Orders on the top menu. You can then click the cancel button against the product you wish to cancel.
As soon as you have cancelled an order, you can create a new order should you wish.

If once the price and supplier are known, you wish to cancel an order, we ask that you do within 24hours of the publication of price and supplier. Failure to do so, may mean that a supplier will attempt to deliver your oil without any further notification.