Yes it is a fairly new addition to their product. I used Burgess without pellet mix for a good two years before switching to Harry Hamster. It is slightly more expensive but still less than 99p per kilo if bought in 15kg bags. I also buy various seeds such as millet and dried fruit for treats from my local health food store. The Roborovski Dwarves in particular love millet sprays, and budgie mix added to their normal dry hamster mix.
Plus Harry Hamster is the only hamster food recommended by the National Hamster Council