I can't believe nobody has mentioned Chocolate Leibniz, preferably the dark variety.
But there's Tim Tams as well, which are widely accepted by theologians as proof that God loves Australians more than anyone else.
Where do Hazelnut Boasters fit into your world-scheme Kirst - are they plain biscuits which happen to have chocolate chunks and hazelnuts in them, or are they chocolate biscuits with plain bits ?
And fruity or filled biscuits ? I have a passion for Date Mamouls in Abu Dhabi, which are a little round pyramid shaped biscuit, filled with a date mixture, and the nicest ones have little bits of pistachio in the mix.
Wrapped - Kit Kat - that's a biscuit isn't it ?
Savoury - close between rough oatcakes and Jacob's wholemeal crackers.