I know this sounds crazy, but there has never been a way for our Administators to delete Entries (properties, caravan parks etc.) in our Admin Console.

Well, now you can.

delete entry action in the Admin Console

The reason it has taken us so long to implement this feature is that there are many implications of deleting something.  For example, although you might have stopped managing a holiday property and no longer wish to see it when you log into the Admin Console, you do not want to lose historic bookings that were made to that property.