There's actually 5 addresses https://accountsettings.ebay.co.uk/uas/addresses

If you don't use the Simple Delivery label, you should still get paid (if there are no issues e.g. a case) - it will likely take longer (around 14 days) and it may have taken longer anyway (e.g. 30 days) being your first sale.

It looks like it was free delivery for the buyer i.e. you paid for the Simple Delivery label. If so, you can try and claim the Simple Delivery label cost back at https://www.ebay.co.uk/claims/simple-delivery/refund/seller