Just to note that over time, as I've made these more often and experimented with the spicing, I've increased to 1 level tsp cumin and 1 level tsp coriander. Other measurements all as originally posted.
That's quite an increase in the cumin and coriander compared with my posted recipe, but I think I was Somewhat too cautious with the spicing at first.
I also fry them 170C for five mins now. Perfect every time