Toby,
Sounds like you've been sold a dud. From the flower colour and the pitcher 
shape you probably have a hybrid. From the pitcher it sounds as if theres a 
bit of leucophylla in it with presumably something with a yellow flower 
(either flava or alata). 
It's a real bummer, especially if you've been nurturing the fraud for 
years. I have a Jonesii which had flowered for the forst time also this 
year and appears to be ssp Rubra instead. As a compensation I also have a 
true Jonesii which is producing mature pitchers for the first time since I 
germinated the seed three years ago. The pitchers are unmistakable (if you 
have Don Schnell's book to compare them with) and the plant is incredibly 
slow growing. Three years old and pitchers less than 8 inches tall!
-- Phil Wilson (cp@pwilson.demon.co.uk)