I'd wondered about that. As I recall, the former RAF St Mawgan is a huge site and I find it hard to believe that every part of it is let out to tenants.
If there isn't a tenant lined up that wants or needs that particular part of the site, why can't the Centre continue if it really is paying a commercial rent.
Conversely, the Heritaqe Centre is being extremely disingenous in publicising it the way they have, when they knew perfectly well it was a short term and potentially finite lease.