Flying a bit blind here but hey... what's new?
I found that you can install the OCS Admin Tools and browse existing Pools.
Still unable to delete them though. Bombs out with a SQL version error;
Failure
[0xC3EC78C6] The version of SQL Server installed on the back-end computer is not supported. SQL 2000 SP4 or later, or SQL 2005 SP1 or later is required.
This is a bit odd as the Back-end computer no longer exists.