Hi,

Theres no "Advanced" link.

I can select "Package Size", which offers a few options, I've put a screenshot.

However, theres no  RM Letter or Large letter up to 100g

The post office will also check the weight and size when dropping off the parcel, so those delivery services are no good for sending items such as clothing ect .

Theres no option to select Custom delivery or anything under £10 ?

Oddly, one or two of my listing that I've either relisted or used an old template still show the original delivery service, ie: Yodel ?

Its all a bit confusing if I'm honest.