When you place an order with us we process a test on your chosen payment method to verify that the card being used is valid and has funds available to honour the payment. This is done as we don’t actually take payment until your friendly Ocado driver has delivered your shop.
The £1 test payment is only reserved and never actually deducted from your account, although some card providers will show this reserve on their online statements.
Once the delivery has been made and payment has been taken the reserve will be released back to your card.