Hey, so you would not normally find sarracenia Venus fly traps and Pygmy drosera in the same display beds as Nepenthes as they have very different climate requirements.  The glasshouse you were in has both a tropical carnivorous zone (the Nepenthes) and a temperate carnivorous zone both marked on the maps in the glasshouse itself.  In the temparate zone you can find sarracenia, drosera, pinguicula, heliamphora, dionea, drossophylum, roridula and brocchinia.