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Harry Hamster isn't suitable for Russian hybrids (that is which species your hams will be) & now Burgess is just a biscuit type food that's no longer suitable, I personally don't rate versele laga food either.
The only way to get good dwarf hamster food in the UK now is to buy online, either the Bunny Dwarf HamsterDream Expert from Zooplus or the Hybrid mix from Rodipet are good, the only other options really are Mixerama & Getzoo but delivery from those is very expensive so you would need to buy quite a large amount & store it in the freezer to save on costs.