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You won't find any foods suitable for a dwarf hamster in the UK now, there really aren't any.
You could order from Rodipet their foods are good & delivery costs are reasonable, you could order a few bags & store them in the freezer to cut costs a bit.
The only other option really is the Bunny dream dwarf hamster expert from Zooplus.
There are a couple of other good German companies, Getzoo & Mixerama but delivery costs are very high.
Just a small piece of veg daily, I haven't found they over eat veg to be honest so you don't have to worry too much, give as much variety as you can too.