eBay will be ending support for listing service Blackthorne early in 2014 and by the end of September, it will be discontinued altogether according to eBay. You can read full details here on the eBay.com site.
Blackthorne was developed independently as a third party application back in 1998 and was subsequently acquired by eBay. It was a popular choice some years ago, but has not been so widely adopted of late.
Whilst this is unlikely to affect many UK usuers, because the service was never widely adopted over here, those who do use it will likely find it a headache to transition to a new listing tool.
We advise you to start now and shop around: we have some suggestions at www.tamebayguide.com.