Happy New Year and thanks for your reply.
I am nervous/close to paranoid about changing my checkout as I have customised local pick up no shipping charges as well as email details using UE to myself and the customer. I have also customised the look of the checkout and cart pages.
Do I need to recreate the customisation for these pages?
How does eCart 6 affect creating a new "Add to Cart" item?
How does eCart 6 affect eCart Object file? Are there more or different features here?