When entering Sender details in step 4 of the click and drop process for a Tracked 24 item there is a question : 'Would you like to have your item collected?'
It is not currently possible to answer 'No' to this question. It is also not possible to remove the collection options at this stage.
Royal Mail Support (in a telephone call) advised the way to do this is to proceed with a collection, use the 'Add to basket' button, and then once the item is in the basket, use the remove function to delete the collection service from the basket.
This 'workaround' is laborious, especially if there more than one item. The workaround is not documented on the 'Sender' details screen, so there is no way the user would know how they should proceed if they do not want a collection.

My suggestion is to allow the user to answer 'No' to collection, or use some other method to allow the user to indicate that they want to print the label and drop the item off.
If this is not possible, then please document the workaround so the user knows there is a way of creating a label for dropping off a Tracked 24 item.