Simple delivery is now mandatory for private sellers.
If your items are too large to be sent using either of the services available, there is a workaround which you can find in the selling discussion forum.
All the details about Simple Delivery are here - follow the links and read the FAQs for the full picture.
https://www.ebay.co.uk/help/sr?query=simple+delivery&origin=1
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
