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With the last one I did just that. I pulled up the order, then searched for the extras and added them. Then I clicked on checkout, went through the process and entered the three numbers on the back of my card - all the rest of the details are saved. At no stage did the instructions lead you back to your basket of groceries.
After the checkout procedure, the basket then said 'amending'. Nowhere did it say that you have to go back into your basket and checkout from there. I assumed the basket was updating, and what I had done would check me out. But not so, it just checked out the original order, and left the extras in the basket.
I'll know now to go back into the basket once i have finished adding. And also, to look out for the e-mail to show I have updated. I hadn't realised they had increased the time you can start the amendments, I'll have a look at that. It was 2 days the last time I did it.
It isn't as easy or user friendly as the tesco one I must say. Although all the supermarkets are difficult to find a delivery, or collect slot, I have been lucky with asda twice for delivery, and tesco once for collect.