Can I still take sold items to Post Office and pay ?

[4404ekb]

Casual seller. 

Can I still take sold items to the Post Office and pay there?  

Also trying to load new listing but "delivery time is missing" prevents.  I chose Royal Mail tracked that says 2-3 days. So what is eBay looking for?

[**peaseblossom**]

You won't be able to buy postage at your post office unless your items are less than £10/100g so you can opt out of Simple Delivery during the listing process.    Read more about Simple Delivery here:

https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/simple-delivery?id=5575