I have this filter :
Me.Form.Filter = "[Body type]<>'Estate' OR [body type]<>'MPV' OR [body type]<>'Hatchback' Or [body type]<>'Saloon' Or [body type]<>'Roadster'"
The syntax appears ok however i get records showing within the exclusions.
if i do this Me.Form.Filter = "[Body type]<>'Estate' it will exclude the group.
Try to change OR to AND
For example A <> 2 OR A <> 1 will always be true