What is the etiquette with non-payers on Ebay

[moomoo1967]

The listings for two items finished on 28th May, I sent the invoice that same hour.
4th June still no payment, so I send another invoice asking if they still want the item if not then please let me know so that I can relist.
I realise that they could have been away for half term but surely the schools are back now.
I was going to email them again on 11th June which would then have been two weeks since the auction ended.
Can I then relist or is there some sort of other procedure that I need to go through ?

[moomoo1967]

please answer on the other thread titled the same
dont know how it posted twice !!!