I tried both of these and now have completed the set.
For flavour A, after careful consideration, I think it’s sour cream and chives.
For flavour C, I’m definitely tasting a foreign flavour, and I’d say it’s Indian spices which leads me in the direction of possibly Chicken Tikka Masala or Curry Chicken. There’s a meat smell and flavour in the mix.
Now, just to await Walkers’ announcement of the true flavours and the question of are they going to be introduced into the permanent line-up. If so, I’ll gladly be purchasing flavours B and C.