Vicky - well, I'm going back 5 years to my latest job change, & I was moving overseas, & their HR was bloody useless, soooo I might be confused - actually I wouldn't be at all surprised if they just thought 'ah sod it' & never completed the process, frankly. Things are a bit less regulated out here in the ME.
But I was just asked - via email - for various information (obvious stuff like any previous names, and previous addresses). I supplied that information, & that was the end of my involvement.
I know my employer does generally pursue DBS checks, as a colleague has a minor conviction resulting from a drunken youthful spree, & he was asked about the circumstances before his application proceeded.
But no, I was definitely not asked to participate in an online process, or to provide paper documents - I'd already sent them scans of BC etc for visa purposes.
Hmm. It's not really, as a process, designed to inspire much confidence!