Agree SD is awful - but you can still book collections from Royal Mail, they charge 30p for the service. You only need to book one collection, and the postie will take all your other parcels as 'extras' - no need to schlep to the PO. At one point in the evolving rubbish SD wesbite there was a link to tak you to RM Collection bookings.

Better though if SD was just scrapped, before it destroys EBAY