A buyer has just sent me a msg and told me that they received their order but received another order from me in error. I had used Simple Delivery to post both items and they should have gone to different addresses, but they ended up at the same address, which means that two identical labels were generated. This was confirmed by the buyer. This is crazy. Luckily this buyer has been very understanding and has agreed to send the parcel onto the right buyer and I'll refund the postage later. I'm gonna be super careful in the future when sending stuff out via Simple Delivery. Might be better to process orders one by one and get a receipt each time instead of putting 5 or 6 orders on the same receipt.