Thanks to both of you for responding.
I eventually cancelled the restore after approximately 7 hours, as it was still parsing the selected backup.
This means that the tool is, in effect, useless to me, as most of my live databases are 40 GB or more (which I don't think would be regarded as a 'large' database to many DBAs).
Unfortunately, I do not envisage my company purchasing Virtual Restore.
For information, what would you recommend as a maximum size database that could be handled by OLR Native??
Is the restore time etc any quicker with OLR Pro (which I believe is part of the Backup Prod tool)?