Returning buyer that left me nasty feedback due to courier problems. Would you sell again to them.

[heffe.pete]

Interested in your thoughts on this. 
also is there a way to block buyers.

[**peaseblossom**]

Anyone who leaves neg f/b goes straight onto my blocked bidder list.   Here's the link:
https://www.ebay.co.uk/bmgt/BuyerBlock

[*guinevere*]

In answer to your opening title, absolutely not.

They would have been on my blocked bidder list and so would have been unable to bid/buy

Blocked Bidders

[plpmr]

Looked at the last 100 feedback you received as a seller and can't see the feedback you are speaking about.