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Re: Stray thread - User definable conditions in Complex Filter

This thread really went astray (http://forums.nbn.org.uk/viewtopic.php?id=180) after a reference to the long-lost Smartgroups disappeared.
So does anyone know how to define conditions in the Complex Filter.
I simply want to be able to filter on a Location Designation type (i.e. just Calcareous grasslands)